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| Brand Name: | XRTOOLS |
| Model Number: | 3pc |
| MOQ: | 200 |
| Price: | 6.8$/PCS |
| Delivery Time: | 30-45days |
| Payment Terms: | L/C, D/P, T/T, Western Union |
Enhance your workshop efficiency with the XINGRUI 3-Piece Inch Size Step Drill Bit Set, crafted for professionals who demand precision, durability, and smooth performance. Each bit is made from industrial-grade High-Speed Steel (HSS) and coated with Titanium Nitride (TiN) — ensuring superior hardness, low friction, and exceptional heat resistance for extended tool life.
Designed for metal, aluminum, copper, brass, stainless steel (thin gauge), and plastic, this set is ideal for electricians, metal fabricators, HVAC technicians, plumbers, and automotive engineers.
Material Selection: Premium HSS (M2 grade equivalent) is selected for its toughness and wear resistance.
Heat Treatment: Each blank undergoes precise hardening and tempering to achieve optimal core hardness and durability.
CNC Precision Grinding: Steps and flutes are CNC-ground to tight tolerances for perfect concentricity and sharp cutting edges.
TiN Coating Application: A PVD Titanium Nitride coating is applied under vacuum conditions, forming an ultra-hard gold surface (HV ≈ 2300).
Quality Inspection: Each bit passes through runout, hardness, and cutting tests to guarantee performance consistency and smooth chip evacuation.
Premium HSS Construction: Engineered for strength, durability, and resistance to wear under high-speed drilling.
TiN Gold Coating: Reduces friction, dissipates heat, and improves cutting efficiency — extending tool life up to 6x compared with uncoated bits.
Precision-Ground Steps: Clean, accurate holes with built-in deburring edges for a professional finish.
135° Split-Point Tip: Prevents walking and ensures faster, more accurate drilling starts.
Universal Fit: Round shank fits all standard drill chucks and drill presses.
Protective Storage Case: Metal box with labeled compartments for easy identification and portability.
| Feature | Specification |
|---|---|
| Material | High-Speed Steel (HSS) |
| Coating | Titanium Nitride (TiN) – Gold |
| Process | Hardened, Tempered & CNC-Ground |
| Tip Angle | 135° Self-Centering |
| Shank | Round |
| Sizes | Bit 1: 1/8"–1/2" (13 steps) Bit 2: 3/16"–7/8" (9 steps) Bit 3: 1/4"–1-3/8" (10 steps) |
| Application | Metal, Stainless Steel (Thin), Aluminum, PVC, Brass, Plastic |
Electrical: Ideal for cutting holes in switch boxes, control panels, and junction boxes.
Metal Fabrication: Perfect for enlarging holes and drilling thin metal plates up to 4mm.
Plumbing & HVAC: Efficiently drills holes in pipes, ducts, and sheet metals for installations.
Automotive: Suitable for vehicle body panels, brackets, and repair work.
DIY & Maintenance: Multi-size solution for workshop and home improvement tasks.
Operate between 300–800 RPM depending on material hardness.
Apply cutting oil for steel or stainless steel to extend lifespan and improve finish.
Use steady, controlled pressure — let the bit do the work.
Q: Can I use these bits for stainless steel?
A: Yes, they are suitable for thin-gauge stainless steel (≤4mm). Always use cutting oil and moderate speed.
Q: How long do they last?
A: The TiN coating provides up to 6× longer life than standard uncoated HSS bits under similar conditions.
Q: Are these bits made to American standard sizes?
A: Yes, this set includes inch-size increments, making it ideal for U.S. and international users working with imperial measurements.
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