Best Drill Bit for Metal — HSS and Cobalt Bits That Cut Clean

Drilling into metal requires the right bit — use a wood bit on steel and you'll dull it in seconds. The best metal drill bits are made from High-Speed Steel (HSS) or cobalt, designed to withstand the heat and hardness of metal cutting. Here are the top picks.

HSS vs. Cobalt: Which Do You Need?

• HSS (High-Speed Steel): Works on aluminum, copper, brass, and mild steel. The standard choice for most home metal drilling tasks.
• Cobalt (HSS-Co): Contains 5–8% cobalt for higher heat resistance. Better for stainless steel, hardened steel, and tough alloys. More expensive but lasts longer on hard metals.
• Titanium-coated HSS: HSS bits with a titanium nitride coating for reduced friction and longer life. Good middle ground between standard HSS and cobalt.

#1 Best All-Purpose Metal Bit Set: Amazon Basics 100-Piece Drill & Driver Bit Set

For homeowners who occasionally drill into metal alongside wood and plastic, the Amazon Basics 100-piece set includes HSS twist bits that handle aluminum, copper, brass, and mild steel. The titanium coating extends bit life and reduces friction. Excellent value for a complete home set.

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#2 Best Professional Metal Bit Set: DEWALT 100-Piece Screwdriving & Drill Bit Set (DWA2FTS100)

For more demanding metal drilling, the DEWALT DWA2FTS100 includes high-quality HSS bits built to professional standards. DEWALT's FlexTorq design reduces bit breakage under load — important when drilling through thick metal.

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Metal Drilling Tips That Make a Real Difference

1. Use a center punch: Mark your drill spot with a punch and hammer to create a small indent — stops the bit from wandering across the metal surface.
2. Apply cutting oil: Reduces heat and friction dramatically. Extends bit life and gives cleaner holes.
3. Drill slow: Lower speed = less heat = longer bit life. This is the opposite of wood drilling.
4. Use a pilot hole: For holes larger than 1/4", drill a small pilot hole first (1/8"), then step up to your final size.
5. Clamp the workpiece: Metal can spin with the bit and cause serious injury. Always clamp.
6. Deburr after drilling: Use a larger bit or deburring tool to remove sharp edges from the hole.

Speed Guide by Metal Type

• Aluminum: Medium-high speed, cutting oil recommended
• Mild steel: Low-medium speed, cutting oil essential
• Stainless steel: Very low speed, more cutting oil, cobalt bits recommended
• Copper/Brass: Medium speed, cutting oil recommended

Safety Tips

• Always wear safety goggles — metal shavings are sharp and fly fast. DEWALT DPG84 Goggles →
• Wear work gloves when handling drilled metal — edges are razor-sharp. HANDLANDY Work Gloves →
• Never hold metal freehand while drilling — always clamp it
• Don't touch the bit or workpiece immediately after drilling — both get very hot

Our Verdict

For most homeowners, the Amazon Basics 100-piece set covers metal drilling alongside all other materials at excellent value. For frequent or demanding metal work, invest in dedicated cobalt bits for stainless steel and hardened metals.