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The Irwin HSS Pro Drill Bit manufactured from high quality HSS steel. They have precision ground cutting edges for fast drilling and perfect finishing, a ground flute for maximum accuracy and fast chip removal and a universal 118º point shape for drilling a wide selection of materials.The Irwin IRW10502271 HSS Pro Drillbits comes in a bulk pack of 10. Specifications:Drillbit diameter: 4.0mmTotal length: 75mmWorking Length: 39mmAdditional Information:• Tip Diameter (mm): 4• Working Length (mm): 43• Overall Length (mm): 75• Pack Qty.: 10