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 118 point shape for drilling a wide selection of materials. The Irwin IRW10502281 HSS Pro Drillbits comes in a bulk pack of 10. Specification:Drillbit diameter: 5.0mmTotal length: 86mmWorking Length: 52mm IRWIN Hss Pro Drill Bits Bulk Pack (10) 5.0Mm Ol: 86Mm Wl:52Mm in Silver