IRWIN 10502562 HSS Cobalt Drill Bit (Din 388, 8.5-Millimetre x 117-Millimetre)

The Irwin 8.5mm HSS Cobalt Drill Bit is designed for larger diameter drilling in stainless steel and other high alloys, offering excellent performance for demanding metalworking applications. This size is particularly useful for pilot holes before larger operations, clearance holes for substantial fixings, and heavy-duty fabrication work. Manufactured from high quality HSS steel with 5% Cobalt content, this drill bit delivers exceptional heat resistance and significantly extended life compared to standard HSS bits. The added Cobalt improves the red hardness of the bit, enabling it to maintain its cutting edge under the high temperatures generated when drilling tough stainless steel and high alloy materials. The 135° split point grinding ensures the bit centres perfectly from initial contact, reducing drilling pressure and eliminating bit walk for accurate hole placement. An industrial quality ground flute design ensures high accuracy drilling whilst removing chips efficiently, preventi