Steel

Cobalt drill bits are the best all-round choice for hardened or stainless steels. Made with 5% cobalt alloy for high heat resistance and longer edge retention. Run slow, use steady pressure, and keep the bit cool for best results. HSS drill bits are not recommended for hardened steel - most will burn out or fail quickly. Only use on very light-duty work or if drilling into already-softened edges.

Designed for cutting large-diameter holes in steel, plastic, and wood — including sheet metal, trunking, junction boxes, and panels. Best used at slow speed with steady pressure to avoid heat build-up, melting, or snagging. Ideal for wide openings in worktops, cladding, or electrical fittings.

Ideal for larger holes or use with high-torque drills

Tungsten carbide-tipped bits for when cobalt isn’t enough. Ideal for extreme materials like high-tensile fasteners, hardened bolts, and heavy-duty security plates. Often used by locksmiths, fabricators, and engineers. Requires precision and care.

For smooth, precise holes in reinforced or high-density materials. Typically used with core drilling machines — ideal for structural work or high-finish installs.