25Pc Industrial Diamond Drill Bit 4241 High Speed Half Ground Jobber Black Finish
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.
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.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.