Irwin HSS Pro Drill Bits

The Irwin HSS Pro Drill Bit in 12mm diameter comes individually supplied, offering convenient single-bit purchasing for professionals requiring occasional replacements for this commonly specified large size. The 12mm diameter is widely used across construction, structural metalwork, and heavy fabrication applications, particularly for large through-bolts, anchors, and industrial fixings. Constructed from high-performance, high-speed steel to DIN 338 standards, this drill bit features a 118° split point shape for increased performance and very good centring. The drill bit ensures precision starting with no need to pre-punch or pilot drill, and penetrates the material quickly, requiring little effort and feed pressure. This reduced shank design is suitable for many trade and industrial applications in alloyed and unalloyed steel, non-ferrous metal, cast iron, and plastics.