5-Piece Inch Size HSS Step Drill Bit Set | Black & Amber Finish for Professional Metal Drilling

Experience precision and durability with the XINGRUI 5-Piece Inch Size Step Drill Bit Set, engineered for professionals who demand consistent cutting performance and extended tool life. Designed for metal, stainless steel, aluminum, brass, copper, and plastic, these black & amber finish step drill bits combine cutting-edge technology with superior craftsmanship, delivering smooth, burr-free holes every time.

Advanced Manufacturing Process

Every XINGRUI step drill bit undergoes a rigorous multi-step production process to ensure precision and reliability:

Material Selection: Premium High-Speed Steel (HSS) is sourced for its hardness, wear resistance, and heat stability.

Heat Treatment: Controlled hardening and tempering processes optimize tool toughness and cutting edge strength.

CNC Precision Grinding: Each flute and step is CNC-ground to guarantee sharp edges, perfect concentricity, and balanced cutting.

Black & Amber Surface Finish: The double oxide coating provides low friction, improved heat dissipation, and enhanced corrosion protection.

Quality Control: Every bit passes hardness, runout, and edge sharpness tests before packaging — ensuring consistent quality across all shipments.

Product Features & Benefits

Industrial-Grade HSS Construction: Tough and precise for long-lasting cutting performance.

Dual-Color Oxide Finish (Black & Amber): Reduces friction and extends tool life under high temperatures.

135° Split-Point Tip: Provides fast starts and prevents walking on metal surfaces.

Precision-Ground Steps: Clean hole transitions and automatic deburring without rework.

Universal Shank Design: Compatible with all standard electric drills and drill presses.

Professional Storage Case: Keeps all five step drills organized, safe, and portable.

Technical Specifications

Applications

Electrical & HVAC: Perfect for control panels, switch boxes, and ductwork.

Metalworking: Creates clean holes and enlarges existing ones in thin metal sheets.

Plumbing: Efficient drilling on PVC and copper pipes.

Automotive & Maintenance: Suitable for vehicle bodywork, brackets, and panel fabrication.

DIY Projects: A versatile solution for workshop or home improvement use.

Packaging & Export Details

Set Includes: 5 pieces of inch-size step drill bits + metal storage case.

Inner Packing: Each set packed in a durable metal or plastic box, labeled with specifications and logo.

Outer Carton: 20–40 sets per carton, sealed with waterproof plastic film and protective cushioning.

Private Label / OEM: Custom logo, color box, or blister packaging available upon request.

Shipment:

Lead Time: 25–30 days after order confirmation.

Port of Loading: Shanghai or Ningbo, China.

Export Markets: United States, Russia, Eastern Europe, South America.

Logistics Options: By sea, air, or express (FedEx, DHL, UPS).

Certifications: ISO9001:2015 certified factory with full inspection before delivery.

FAQ

Q: Can it drill stainless steel effectively?
A: Yes, for thin stainless steel sheets (≤4mm), use low speed and cutting fluid for best results.

Q: Is this set available in inch sizes?
A: Yes, all steps are manufactured to U.S. inch-size standards, ideal for American and international buyers.

Q: Can I customize the color or packaging?
A: Yes, XINGRUI offers OEM branding and custom packaging options for bulk orders.

3-Piece TiN Coated HSS Step Drill Bit Set | Professional Grade for Metal, Electrical & Plumbing Achieve workshop efficiency with our professional 3-Piece Step Drill Bit Set. Engineered from High-Speed Steel (HSS) and enhanced with a high-performance Titanium Nitride (TiN) coating, these bits are built to last longer, run cooler, and drill faster through tough materials. The precision-ground steps and self-centering tip allow you to drill multiple hole sizes perfectly and deburr in one swift operation, eliminating the need for multiple tools. Unmatched Durability & Precision Engineering Premium HSS Material & Heat Treatment: Crafted from high-grade High-Speed Steel that undergoes a precise hardening and tempering process. This creates a tough, resilient core that resists chipping and maintains sharpness under pressure, ensuring a long tool life. Advanced TiN (Titanium Nitride) Coating: The distinctive gold TiN coating is not just for looks. It creates an ultra-hard surface that reduces friction and heat buildup by up to 50%. This results in a significantly extended bit life, allowing for faster cutting speeds and improved performance in steel and other hard metals. Fully Ground Flutes & Steps: Each step is meticulously CNC-ground to a sharp, precise edge. This advanced manufacturing process ensures clean, accurate cuts with smooth chip evacuation and includes an integrated deburring edge for a finished hole ready for use. 135° Self-Centering Tip: Saves time and improves accuracy. The sharp tip bites instantly, preventing the bit from "walking" or skidding on curved surfaces, guaranteeing perfect hole placement every time. Professional Metal Storage Case: Includes a robust, labeled metal case for secure storage, easy organization, and portability, protecting your investment on any job site. Technical Specifications & Applications at a Glance Feature Specification Material High-Grade High-Speed Steel (HSS) Production Process Hardened & Tempered, CNC-Ground Flutes Surface Coating Titanium Nitride (TiN) - Gold Shank Type Round Shank (fits all standard 3-jaw drill chucks) Point Angle 135° Self-Centering Sizes Included Bit 1: 4 - 12 mm Bit 2: 4 - 20 mm Bit 3: 4 - 30 mm Application Materials Mild Steel, Stainless Steel (thin gauge), Aluminum, Copper, Brass, PVC, Plastic Professional Applications Electrical Work: The perfect tool for quickly and cleanly installing outlets and switches in electrical boxes and panels. Metal Fabrication & HVAC: Ideal for enlarging holes, fabricating ducts, and working on sheet metal up to 4mm thick. Plumbing & Automotive: Excellent for drilling and deburring holes in PVC pipes, automotive body panels, and creating custom brackets. General DIY & MRO: A versatile, time-saving set for countless maintenance, repair, and home improvement projects. How to Use for Optimal Results Use a Steady Speed: Operate at a medium RPM (300-800) with consistent, firm pressure. Let the bit's sharp edges do the cutting. Lubrication is Key: For steel and stainless steel, apply cutting oil to further reduce heat, extend bit life, and achieve a smoother finish. Tool Compatibility: For best results, use in a standard drill or drill press. Not recommended for impact drivers, as the hammering action can damage the precise cutting edges. FAQ Q: Why is the TiN coating beneficial? A: The Titanium Nitride coating increases surface hardness, reduces friction, and dissipates heat better, making the bit last up to 6x longer than uncoated HSS bits. Q: Can this set drill through thick metal? A: Step bits are designed for sheet materials. They are most effective on materials within the thickness of one step (approx. 3-5mm). For thicker block metal, standard twist drills are more appropriate. Q: Is this set suitable for professional daily use? A: Absolutely. The combination of hardened HSS, TiN coating, and precision grinding makes this set robust enough for professional workshop and job site environments. Need Imperial Sizes? Explore our range of step drill bits with fractional inch measurements for all your project needs!3-Piece TiN Coated HSS Step Drill Bit Set | Professional Grade for Metal, Electrical & Plumbing Achieve workshop efficiency with our professional 3-Piece Step Drill Bit Set. Engineered from High-Speed Steel (HSS) and enhanced with a high-performance Titanium Nitride (TiN) coating, these bits are built to last longer, run cooler, and drill faster through tough materials. The precision-ground steps and self-centering tip allow you to drill multiple hole sizes perfectly and deburr in one swift operation, eliminating the need for multiple tools. Unmatched Durability & Precision Engineering Premium HSS Material & Heat Treatment: Crafted from high-grade High-Speed Steel that undergoes a precise hardening and tempering process. This creates a tough, resilient core that resists chipping and maintains sharpness under pressure, ensuring a long tool life. Advanced TiN (Titanium Nitride) Coating: The distinctive gold TiN coating is not just for looks. It creates an ultra-hard surface that reduces friction and heat buildup by up to 50%. This results in a significantly extended bit life, allowing for faster cutting speeds and improved performance in steel and other hard metals. Fully Ground Flutes & Steps: Each step is meticulously CNC-ground to a sharp, precise edge. This advanced manufacturing process ensures clean, accurate cuts with smooth chip evacuation and includes an integrated deburring edge for a finished hole ready for use. 135° Self-Centering Tip: Saves time and improves accuracy. The sharp tip bites instantly, preventing the bit from "walking" or skidding on curved surfaces, guaranteeing perfect hole placement every time. Professional Metal Storage Case: Includes a robust, labeled metal case for secure storage, easy organization, and portability, protecting your investment on any job site. Technical Specifications & Applications at a Glance Feature Specification Material High-Grade High-Speed Steel (HSS) Production Process Hardened & Tempered, CNC-Ground Flutes Surface Coating Titanium Nitride (TiN) - Gold Shank Type Round Shank (fits all standard 3-jaw drill chucks) Point Angle 135° Self-Centering Sizes Included Bit 1: 4 - 12 mm Bit 2: 4 - 20 mm Bit 3: 4 - 30 mm Application Materials Mild Steel, Stainless Steel (thin gauge), Aluminum, Copper, Brass, PVC, Plastic Professional Applications Electrical Work: The perfect tool for quickly and cleanly installing outlets and switches in electrical boxes and panels. Metal Fabrication & HVAC: Ideal for enlarging holes, fabricating ducts, and working on sheet metal up to 4mm thick. Plumbing & Automotive: Excellent for drilling and deburring holes in PVC pipes, automotive body panels, and creating custom brackets. General DIY & MRO: A versatile, time-saving set for countless maintenance, repair, and home improvement projects. How to Use for Optimal Results Use a Steady Speed: Operate at a medium RPM (300-800) with consistent, firm pressure. Let the bit's sharp edges do the cutting. Lubrication is Key: For steel and stainless steel, apply cutting oil to further reduce heat, extend bit life, and achieve a smoother finish. Tool Compatibility: For best results, use in a standard drill or drill press. Not recommended for impact drivers, as the hammering action can damage the precise cutting edges. FAQ Q: Why is the TiN coating beneficial? A: The Titanium Nitride coating increases surface hardness, reduces friction, and dissipates heat better, making the bit last up to 6x longer than uncoated HSS bits. Q: Can this set drill through thick metal? A: Step bits are designed for sheet materials. They are most effective on materials within the thickness of one step (approx. 3-5mm). For thicker block metal, standard twist drills are more appropriate. Q: Is this set suitable for professional daily use? A: Absolutely. The combination of hardened HSS, TiN coating, and precision grinding makes this set robust enough for professional workshop and job site environments. Need Imperial Sizes? Explore our range of step drill bits with fractional inch measurements for all your project needs3-Piece TiN Coated HSS Step Drill Bit Set | Professional Grade for Metal, Electrical & Plumbing Achieve workshop efficiency with our professional 3-Piece Step Drill Bit Set. Engineered from High-Speed Steel (HSS) and enhanced with a high-performance Titanium Nitride (TiN) coating, these bits are built to last longer, run cooler, and drill faster through tough materials. The precision-ground steps and self-centering tip allow you to drill multiple hole sizes perfectly and deburr in one swift operation, eliminating the need for multiple tools. Unmatched Durability & Precision Engineering Premium HSS Material & Heat Treatment: Crafted from high-grade High-Speed Steel that undergoes a precise hardening and tempering process. This creates a tough, resilient core that resists chipping and maintains sharpness under pressure, ensuring a long tool life. Advanced TiN (Titanium Nitride) Coating: The distinctive gold TiN coating is not just for looks. It creates an ultra-hard surface that reduces friction and heat buildup by up to 50%. This results in a significantly extended bit life, allowing for faster cutting speeds and improved performance in steel and other hard metals. Fully Ground Flutes & Steps: Each step is meticulously CNC-ground to a sharp, precise edge. This advanced manufacturing process ensures clean, accurate cuts with smooth chip evacuation and includes an integrated deburring edge for a finished hole ready for use. 135° Self-Centering Tip: Saves time and improves accuracy. The sharp tip bites instantly, preventing the bit from "walking" or skidding on curved surfaces, guaranteeing perfect hole placement every time. Professional Metal Storage Case: Includes a robust, labeled metal case for secure storage, easy organization, and portability, protecting your investment on any job site. Technical Specifications & Applications at a Glance Feature Specification Material High-Grade High-Speed Steel (HSS) Production Process Hardened & Tempered, CNC-Ground Flutes Surface Coating Titanium Nitride (TiN) - Gold Shank Type Round Shank (fits all standard 3-jaw drill chucks) Point Angle 135° Self-Centering Sizes Included Bit 1: 4 - 12 mm Bit 2: 4 - 20 mm Bit 3: 4 - 30 mm Application Materials Mild Steel, Stainless Steel (thin gauge), Aluminum, Copper, Brass, PVC, Plastic Professional Applications Electrical Work: The perfect tool for quickly and cleanly installing outlets and switches in electrical boxes and panels. Metal Fabrication & HVAC: Ideal for enlarging holes, fabricating ducts, and working on sheet metal up to 4mm thick. Plumbing & Automotive: Excellent for drilling and deburring holes in PVC pipes, automotive body panels, and creating custom brackets. General DIY & MRO: A versatile, time-saving set for countless maintenance, repair, and home improvement projects. How to Use for Optimal Results Use a Steady Speed: Operate at a medium RPM (300-800) with consistent, firm pressure. Let the bit's sharp edges do the cutting. Lubrication is Key: For steel and stainless steel, apply cutting oil to further reduce heat, extend bit life, and achieve a smoother finish. Tool Compatibility: For best results, use in a standard drill or drill press. Not recommended for impact drivers, as the hammering action can damage the precise cutting edges. FAQ Q: Why is the TiN coating beneficial? A: The Titanium Nitride coating increases surface hardness, reduces friction, and dissipates heat better, making the bit last up to 6x longer than uncoated HSS bits. Q: Can this set drill through thick metal? A: Step bits are designed for sheet materials. They are most effective on materials within the thickness of one step (approx. 3-5mm). For thicker block metal, standard twist drills are more appropriate. Q: Is this set suitable for professional daily use? A: Absolutely. The combination of hardened HSS, TiN coating, and precision grinding makes this set robust enough for professional workshop and job site environments. Need Imperial Sizes? Explore our range of step drill bits with fractional inch measurements for all your project needs!

3-Piece TiN Coated HSS Step Drill Bit Set | Professional Grade for Metal, Electrical & Plumbing Achieve workshop efficiency with our professional 3-Piece Step Drill Bit Set. Engineered from High-Speed Steel (HSS) and enhanced with a high-performance Titanium Nitride (TiN) coating, these bits are built to last longer, run cooler, and drill faster through tough materials. The precision-ground steps and self-centering tip allow you to drill multiple hole sizes perfectly and deburr in one swift operation, eliminating the need for multiple tools. Unmatched Durability & Precision Engineering Premium HSS Material & Heat Treatment: Crafted from high-grade High-Speed Steel that undergoes a precise hardening and tempering process. This creates a tough, resilient core that resists chipping and maintains sharpness under pressure, ensuring a long tool life. Advanced TiN (Titanium Nitride) Coating: The distinctive gold TiN coating is not just for looks. It creates an ultra-hard surface that reduces friction and heat buildup by up to 50%. This results in a significantly extended bit life, allowing for faster cutting speeds and improved performance in steel and other hard metals. Fully Ground Flutes & Steps: Each step is meticulously CNC-ground to a sharp, precise edge. This advanced manufacturing process ensures clean, accurate cuts with smooth chip evacuation and includes an integrated deburring edge for a finished hole ready for use. 135° Self-Centering Tip: Saves time and improves accuracy. The sharp tip bites instantly, preventing the bit from "walking" or skidding on curved surfaces, guaranteeing perfect hole placement every time. Professional Metal Storage Case: Includes a robust, labeled metal case for secure storage, easy organization, and portability, protecting your investment on any job site. Technical Specifications & Applications at a Glance Feature Specification Material High-Grade High-Speed Steel (HSS) Production Process Hardened & Tempered, CNC-Ground Flutes Surface Coating Titanium Nitride (TiN) - Gold Shank Type Round Shank (fits all standard 3-jaw drill chucks) Point Angle 135° Self-Centering Sizes Included Bit 1: 4 - 12 mm Bit 2: 4 - 20 mm Bit 3: 4 - 30 mm Application Materials Mild Steel, Stainless Steel (thin gauge), Aluminum, Copper, Brass, PVC, Plastic Professional Applications Electrical Work: The perfect tool for quickly and cleanly installing outlets and switches in electrical boxes and panels. Metal Fabrication & HVAC: Ideal for enlarging holes, fabricating ducts, and working on sheet metal up to 4mm thick. Plumbing & Automotive: Excellent for drilling and deburring holes in PVC pipes, automotive body panels, and creating custom brackets. General DIY & MRO: A versatile, time-saving set for countless maintenance, repair, and home improvement projects. How to Use for Optimal Results Use a Steady Speed: Operate at a medium RPM (300-800) with consistent, firm pressure. Let the bit's sharp edges do the cutting. Lubrication is Key: For steel and stainless steel, apply cutting oil to further reduce heat, extend bit life, and achieve a smoother finish. Tool Compatibility: For best results, use in a standard drill or drill press. Not recommended for impact drivers, as the hammering action can damage the precise cutting edges. FAQ Q: Why is the TiN coating beneficial? A: The Titanium Nitride coating increases surface hardness, reduces friction, and dissipates heat better, making the bit last up to 6x longer than uncoated HSS bits. Q: Can this set drill through thick metal? A: Step bits are designed for sheet materials. They are most effective on materials within the thickness of one step (approx. 3-5mm). For thicker block metal, standard twist drills are more appropriate. Q: Is this set suitable for professional daily use? A: Absolutely. The combination of hardened HSS, TiN coating, and precision grinding makes this set robust enough for professional workshop and job site environments. Need Imperial Sizes? Explore our range of step drill bits with fractional inch measurements for all your project needs!p drill bits with fractional inch measurements for all your project needs!