Use a masonry bit rated for brick, block or concrete and a compatible drill mode. Hard concrete or larger holes may require an SDS rotary hammer and matching bit.
Bits for Accurate Holes in Timber, Metal and Masonry
Drill bits cut accurate holes only when their geometry matches the material. Timber, metal and masonry bits have different tips and flute designs, so select by substrate before choosing diameter and length.
Confirm the shank fits the chuck or tool holder. Standard round or hex shanks suit many drills, while SDS systems require a compatible rotary hammer.
Use the recommended speed and clear swarf regularly. A pilot hole can guide larger diameters, while sharp bits reduce heat, wandering and load on the tool.
Drill Bits FAQs
High-speed steel bits are commonly used for metal and can also drill some plastics and timber. Harder metals may call for cobalt or another specialist specification.
The bit may be blunt, the surface unmarked or the speed too high at the start. Use a centre mark or pilot hole where appropriate and begin under control.
SDS bits have a slotted shank that locks into a compatible rotary-hammer chuck and allows hammer movement. They do not fit a standard chuck without an approved adaptor.
Use a sharp bit, suitable speed and steady pressure, clearing chips frequently. Apply an appropriate cutting fluid for metal where recommended.