Irwin HSS Cobalt Drillbits ( Pack 5) 9.0mm IRW10502536 Irwin HSS Cobalt Drillbits are perfect for drilling stainless steel and other high alloy steels. They have 5% Cobalt for higher heat and abrasion resistance and a heavy-duty web construction for strength and durability. The 135° split point begins drilling immediately, minimising bit walk and are manufactured to DIN 338 Standards.The IRW10502536 HSS Cobalt Drillbits are supplied in a pack of 5 and have the following dimensions: Diameter: 9.0mm. Total length: 125mm. Working length: 81mm. IRW10502536