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Drill Bits & Sets

Drill bits for metal, wood, and plastics. HSS twist drills in metric and imperial, sold individually or in sets. Roll-forged, edge-ground, and fully-ground options. Cobalt variants for harder materials. Brands include Siegen Tools and Sealey.

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Showing 1–48 of 424 results

Picking the right drill bit

Standard HSS (high-speed steel) twist drills handle most ferrous and non-ferrous metals, wood, and rigid plastics. Roll-forged bits are cost-effective for general work. Edge-ground bits offer better concentricity. Fully-ground bits — milled along the entire flute — run truer and cut cleaner, worth the extra if you drill tight-tolerance holes or work with harder stock.

Cobalt HSS (typically 5–8% cobalt) stays harder at elevated temperatures. Use it for stainless steel, cast iron, and other materials that work-harden or generate heat. Cobalt is more brittle than plain HSS, so match the bit to the job — it's not a universal upgrade.

DIN 338 is the common European standard for parallel-shank twist drills. Most bench and hand drills take it without issue. Imperial sizes matter if you're tapping threads to BSW, UNC, or UNF, or matching existing imperial-drilled work. Check your tap chart before ordering — a close metric size won't cut the thread properly.

Sets are practical if you're outfitting a new toolbox or topping up worn sizes. Individual bits in packs of ten make sense when one diameter sees heavy rotation. Store bits in an index or roll — loose bits in a drawer go blunt faster.

Frequently asked questions

What is the difference between roll-forged and fully-ground drill bits?
Roll-forged HSS bits are cost-effective for general drilling in metal, wood, and plastics. Fully-ground bits are milled along the entire flute, so they run truer and cut cleaner — useful for tight-tolerance work or harder stock.
When should I use cobalt drill bits instead of standard HSS?
Cobalt HSS bits stay harder at elevated temperatures, making them suited to stainless steel, cast iron, and materials that work-harden or generate heat. Cobalt is more brittle than plain HSS, so use it only where the extra hardness is needed.
What does DIN 338 mean on a drill bit set?
DIN 338 is the European standard for parallel-shank twist drills. Most bench and hand drills accept this shank type without issue.
Should I buy individual drill bits or a drill bit set?
Sets are practical for outfitting a new toolbox or replacing multiple worn sizes. Individual bits sold in packs of ten make sense when one diameter sees heavy use.
Do imperial drill bits fit metric chucks?
Imperial and metric drill bits both use parallel shanks, so they fit the same chucks. Imperial sizes matter when tapping BSW, UNC, or UNF threads — a close metric size will not cut the thread properly.
Can HSS twist drills be used in wood and plastic as well as metal?
Yes. Standard HSS twist drills handle ferrous and non-ferrous metals, wood, and rigid plastics.