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Drill Bit Set
Created with Pixso. 25Pc Industrial Diamond Drill Bit 4241 High Speed Half Ground Jobber Black Finish

25Pc Industrial Diamond Drill Bit 4241 High Speed Half Ground Jobber Black Finish

Brand Name: XRTOOLS
Model Number: 25PC
MOQ: 200
Price: 3.6$/PCS
Delivery Time: 30-45days
Payment Terms: L/C, D/P, T/T, Western Union
Detail Information
Place of Origin:
CHINA
Certification:
ISO9000
Type:
Twist Drill Bit
Use:
Metal Drilling
Material:
HSS-4241
Product Name:
25PCS Drill Bit Set
Application:
Drilling Holes,Stainless Steel,concrete Etc.
Shank:
Round/Three-flatted/Hex Shank And So On
Process:
Roll Forged
Color:
Black Coated
Feature:
Sharpness,High Speed.Straight Smooth Edge,Longer Working Life
Packing:
Aluminium Case Or As Your Request
Packaging Details:
metal box
Supply Ability:
300,0000PCS PER MOUTH
Highlight:

25Pc industrial diamond drill bit

,

industrial diamond drill bit 4241

,

HRC60 high speed metal drill bits

Product Description

25-Pc 4241 Black Drill Bit Set — Roll-Forged, Jobber Length, 118° Point, Round Shank


Built for everyday drilling at a smart price, the XRTOOLS 25-piece 4241 HSS set uses a roll-forged manufacturing process that maximizes toughness for handheld and jobsite work. A durable black oxide finish helps reduce friction and resist corrosion, while jobber-length, round-shank bits fit any standard 3-jaw chuck. Ideal for wood, plastics, aluminum, and mild steel.

 

25Pc Industrial Diamond Drill Bit 4241 High Speed Half Ground Jobber Black Finish 0

 

Why this set works (multi-angle value)


1.Tough body: Roll-forged 4241 HSS absorbs shock and resists chipping—great for cordless drills.

2.Clean starts: 118° point gives smooth entry and easy re-sharpening on a bench grinder.

3.Cooler cutting: Black oxide surface improves lubricity and chip flow for cleaner holes.

4.All the sizes you need: 25 pcs cover everyday diameter steps for shop and install work.

5.Organized & portable: Indexed case with clear size callouts speeds selection and inventory.

 

Product Specifications

 

Feature Details
Material HSS 4241
Manufacturing Roll-forged twist drill body
Point Angle 118° conventional point (easy to resharpen)
Flutes Roll-forged twist flutes, optimized for handheld drilling
Length Type Jobber
Shank Round, fits 3-jaw chucks (corded, cordless, drill press)
Surface Finish Black oxide (steam-tempered black optional for OEM)
Hardness (typ.) ~HRC 60–62 after heat treatment
Recommended Materials Wood, plastics, aluminum, mild steel (thin section)
Not Recommended Stainless/hardened steels (use M35/M42 cobalt instead)
Set Count 25 pieces
Storage Indexed metal/plastic case with size markings

 

Size Map — 25-Pc Metric (1.0–13.0 mm, 0.5 mm steps)

 

1.0 1.5 2.0 2.5 3.0
3.5 4.0 4.5 5.0 5.5
6.0 6.5 7.0 7.5 8.0
8.5 9.0 9.5 10.0 10.5
11.0 11.5 12.0 12.5 13.0

 

Typical Applications


Woodworking & cabinetry: pilot holes, hardware installs, shelf pins.

Plastics & composites: PVC/ABS/acrylic—use light feed to avoid melting.

Light metals: thin aluminum, brass, and mild steel sheet/channel.

Maintenance & install: brackets, panels, electrical boxes, site fit-outs.

 

Usage Tips


Mild steel: moderate RPM, steady feed, cutting oil recommended; peck to clear chips.

Aluminum: higher RPM; light oil gives a bright finish.

Plastics: high RPM, light feed; back up the exit side to prevent breakout.

Care: if chatter or heat marks appear, dress lips evenly to restore symmetry.

 

Packaging & Wholesale (OEM-Ready)


Indexed storage case (metal or heavy-duty plastic) with size callouts.

Retail sleeve with barcode; master cartons (10–20 sets/inner) for distribution.

Private label: laser-etched logo, custom size maps (metric/imperial), EN/RU bilingual labels, instruction insert

 

FAQ


Q1: Can these drill stainless steel?
A: They’re optimized for wood, plastics, aluminum, and mild steel. For stainless or hardened steels, choose M35/M42 cobalt bits.

Q2: Are they suitable for cordless drills?
A: Yes—jobber length and round shanks are ideal for handheld use.

Q3: Can I get a black & gold finish?
A: This SKU is black oxide. Black-and-gold (steam/oxide + polished lands) is available for OEM orders.

Q4: Do you offer custom assortments?
A: Yes—metric, imperial, or mixed maps and custom packaging are available for wholesale/OEM.