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Premium Black & Gold Dual-Finish HSS Drill Bits
High-grade HSS build delivers unmatched strength and flexible drilling performance
135° split cutting point achieves rapid penetration and efficient hole making
Premium dual black-gold coating greatly extends drill bit service lifespan
Bronze oxide layered coating enhances wear and corrosion resistance
Trusted by Global Brands
OEM Partner for Industry Leaders
Customization & Packaging
Complete OEM/ODM solutions tailored to your brand requirements
Build Your Own Brand with Custom M42 Cobalt Heavy Duty Drill Bits
- Custom black oxide flute + gold titanium dual surface finish, anti-rust, anti-friction and heat-resistant for long service life.
- Custom HSS, M35, M42 cobalt steel grade optional, suitable for drilling steel, stainless steel, aluminum and alloy metal.
- Custom diameter, overall length, flute length, standard and special non-standard sizes for industrial wholesale and engineering projects.
- Custom 118°/135° split point design, automatic centering, no walking, clean and burr-free drilling.
Application Notes
Discover the versatile applications and material compatibility of our products
Drilling PVC
- •Designed for smooth drilling in PVC and plastic materials, this twist drill bit helps create clean holes with less cracking or edge damage. The sharp cutting edge supports stable drilling, easy chip removal, and reliable performance for pipe, sheet, and plastic fitting applications.
Real Factory & Application Videos
Watch real manufacturing and field applications to verify quality, performance, and supply capability
How Can Buyers Get Factory Wholesale Price For Fully Ground Cobalt 15mm Twist Drills？
High-Speed Cutting Performance Without Melting Or Smearing The Workpiece.OEM/ODM Customization Available For Logo, Packaging And Special Sizes
Drilling Stainless Steel: What Twist Drill Do You Really Need?
Optimized Point Geometry For Clean, Burr-Free Holes In Soft Aluminum AlloysComplete Material Test Reports And Quality Certifications For B2B Buyers
How Can Buyers Get Factory Wholesale Price For Fully Ground Cobalt Twist Drills?
Competitive Factory Wholesale Pricing, No Middleman Markup
Our Production Process
From raw materials to finished products, every step is meticulously controlled to ensure superior quality and precision.
Raw Material Cutting
Heat Treatment
Coarse Grinding
Shank Grinding
Flute Edge Grinding
Fine Grinding
Double Angle
Angle Grinding
Sharping Edge
International Certifications
Our products meet the highest international standards and are certified by leading quality organizations worldwide.
RoHS Certificate
• Expiry Date:2027.10.05
ISO 9001:2015
• Expiry Date:2028.10.05
SGS Audit Report
• Expiry Date:2028.01.05
Product Spec Table
| SKU | Key Specs | Material / Coating | Packaging |
|---|---|---|---|
| 1/64"/0.5mm | 12mm Flute Length / 34mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 3/64"/1.0mm | 12mm Flute Length / 34mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 1/16"/1.5mm | 20mm Flute Length / 43mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 5/64"/2.0mm | 24mm Flute Length / 49mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 3/32"/2.5mm | 30mm Flute Length / 57mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 7/64"/3.0mm | 33mm Flute Length / 61mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 9/34"/3.5mm | 39mm Flute Length / 70mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 5/32"/4.0mm | 43mm Flute Length / 75mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 11/64"/4.5mm | 47mm Flute Length / 80mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 3/16"/5.0mm | 52mm Flute Length / 86mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 7/32"/5.5mm | 57mm Flute Length / 93mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 15/64"/6.0mm | 57mm Flute Length / 93mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 1/4"/6.5mm | 63mm Flute Length / 101mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 17/64"/7.0mm | 69mm Flute Length / 109mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 9/32"/7.5mm | 169mm Flute Length / 101mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 5/16"/8.0mm | 75mm Flute Length / 117mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 21/64"/8.5mm | 75mm Flute Length / 117mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 11/32"/9.0mm | 81mm Flute Length / 125mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 3/8"/9.5mm | 81mm Flute Length / 125mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 25/64"/10.0mm | 87mm Flute Length / 133mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 13/32"/10.5mm | 87mm Flute Length / 133mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 27/26"/11mm | 94mm Flute Length / 142mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 7/16"/11.5mm | 94mm Flute Length / 142mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 15/32"/12mm | 101mm Flute Length / 151mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 31/64"/12.5mm | 101mm Flute Length / 151mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 1/2"/13.0mm +mm | 101mm Flute Length / 151mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 17/32"/13.5mm | 108mm Flute Length / 160mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 9/16"/14.0mm | 108mm Flute Length / 160mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 37/64"/14.5mm | 114mm Flute Length / 169mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 19/32"/15.0mm | 114mm Flute Length / 169mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 39/64"/15.5mm | 120mm Flute Length / 178mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 5/8"/16.0mm | 120mm Flute Length / 178mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 21/32"/16.5mm | 125mm Flute Length / 184mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 43/64"/17.0mm | 125mm Flute Length / 184mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 11/16"/17.5mm | 130mm Flute Length / 191mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 45/64"/18.0mm | 130mm Flute Length / 191mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 47/64"/18.5mm | 135mm Flute Length / 198mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 3/4"/19.0mm | 135mm Flute Length / 198mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 49/64"/19.5mm | 140mm Flute Length / 205mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
| 25/32"/20.0mm | 140mm Flute Length / 205mm Overall Length | M35/M42 Body Material/Custom Coated | Plastic Box/Paper Box/Customization |
Frequently Asked Questions
Everything you need to know about our products, customization options, and ordering process.
What Are Black And Gold Drill Bits?
Black and gold drill bits are premium high-speed steel bits with surface coating for wear resistance, sharp cutting and long service life.
What Are Dewalt Black And Gold Drill Bits Made Of
Dewalt black and gold drill bits are crafted from high quality HSS steel with black oxide and titanium gold coating for durability.
Are Dewalt Black And Gold Drill Bits Good for Metal?
Yes, they perform excellently for drilling mild steel, iron, alloy and common metal materials with clean and smooth holes.
Are Black or Gold Drill Bits for Metal?
Both black oxide and gold titanium drill bits are specially designed and suitable for drilling various metal workpieces.
Are Dewalt Black And Gold Drill Bits Good?
They are reliable in hardness, wear resistance and cutting speed, cost-effective for household and industrial drilling tasks.
Is There A Difference Between Gold And Black Drill Bits?
Gold bits add titanium coating for higher heat resistance; black bits use black oxide for lubrication and anti-rust performance.
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Trusted by businesses worldwide
See what our global partners say about our premium drilling tools and cutting solutions.
"Black & gold dual-finish surface brings excellent heat dissipation. It stays sharp much longer when drilling mild steel and alloy steel. Greatly cut our tool replacement cost."
Brian Taylor
Metal Processing Factory Supervisor
UK
"Premium black and gold appearance is very attractive for online sales. High cost performance leads to very few after-sales complaints. Stable quality makes repurchase rate very high."
Sophie Laurent
Online Hardware Store Owner
France
"Dual-finish coating provides good rust resistance for long-term storage. Complete size range from small to large specs. We can meet all customer orders with one supplier."
Jack Peterson
Industrial Hardware Wholesaler
USA
"Black & gold dual-finish surface brings excellent heat dissipation. It stays sharp much longer when drilling mild steel and alloy steel. Greatly cut our tool replacement cost."
Brian Taylor
Metal Processing Factory Supervisor
UK
"Premium black and gold appearance is very attractive for online sales. High cost performance leads to very few after-sales complaints. Stable quality makes repurchase rate very high."
Sophie Laurent
Online Hardware Store Owner
France
"Dual-finish coating provides good rust resistance for long-term storage. Complete size range from small to large specs. We can meet all customer orders with one supplier."
Jack Peterson
Industrial Hardware Wholesaler
USA
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