The Irwin Brad Point Drill Bits are specially designed for precision wood drilling, ideal for furniture and cabinet making. The centre point is for easy start up and the spurred cutting head is designed to reduce splintering and ensure smooth clean holes. The body is fully hardened for maximum wear resistance. They also have wide flutes which provide a fast, continuous flow of chips. The Irwin IRW10502798 Brad Point drill bit has the following dimensions:Drillbit diameter: 12.0mmTotal length: 145mmWorking Length: 100mm IRWIN Brad Point Drill Bit 12Mm in Silver