Irwin HSS Pro Drill Bits

The Irwin HSS Pro Drill Bit in 8.5mm diameter comes in a bulk pack of 5, offering excellent value for trade professionals working with this larger mid-range size. The 8.5mm diameter is particularly useful for heavy-duty construction, structural metalwork, and creating clearance holes for large fixings across steel, timber, and other materials. Featuring high-quality HSS steel construction, this drill bit is designed to withstand regular professional use in demanding environments. The precision ground cutting edges deliver fast drilling with perfect finishing, whilst the ground flute design ensures maximum accuracy and promotes fast chip removal, maintaining clean cutting performance.