Drill Bit Selection: Matching Bits to Materials

The right drill bit makes clean holes quickly. The wrong one wastes time, damages materials, and wears out fast. Here's how to choose correctly for any material.

HSS Bits - The All-Rounders

High-Speed Steel bits handle most metals, plastics, and wood. They're affordable and widely available. For occasional drilling in mixed materials, a decent HSS set covers most bases. Look for titanium-coated versions for better heat resistance and longer life.

Masonry Bits - Concrete and Brick

Recognisable by their carbide tips, masonry bits are designed for the hammer action of an SDS or combi drill. Using them without hammer mode just generates heat and frustration. The tip geometry matters - sharper points for precision, flatter profiles for speed in softer masonry.

Wood Bits - Multiple Options

Brad point bits give cleaner entry holes than twist drills in wood. Spade bits cut larger holes quickly but leave rougher edges. Forstner bits create flat-bottomed holes perfect for concealed hinges. Auger bits excel at deep, straight holes in timber.

Specialised Bits

• Tile bits: Carbide tipped with spear points for ceramics
• Glass bits: Diamond-coated for cutting through glass
• Step bits: For progressively enlarging holes in sheet metal
• Hole saws: For large diameter holes in various materials

Speed and Pressure

Different materials need different approaches:

• Metal: Slower speed, steady pressure, use cutting oil
• Wood: Higher speed, let the bit do the work
• Masonry: Moderate speed, hammer action, clear dust regularly
• Plastics: Slower to prevent melting, sharp bits essential

Sharpening and Replacement

Blunt bits generate heat, wander off-line, and produce poor finishes. HSS bits can be sharpened with a grinding wheel or dedicated sharpener. Carbide-tipped masonry bits are harder to sharpen - often replacement is more practical.

Browse our drilling accessories for quality bits and sets.