Irwin HSS Pro Drill Bits

The Irwin HSS Pro Drill Bit in 12mm diameter is supplied in a bulk pack of 5, making it a cost-effective choice for trade professionals who frequently work with 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-quality HSS steel, this drill bit provides reliable performance across a wide range of demanding industrial applications. The precision ground cutting edges enable fast drilling whilst ensuring perfect finishing, and the ground flute design delivers maximum accuracy combined with efficient chip removal throughout extended drilling operations in steel, non-ferrous metals, and cast iron.