Draper Diamond Core Bit, 78 x 150mm DR-43712Manufactured from good quality steel with sintered diamond segment. For cutting holes for pipe and conduit. Thread 1/2" BSP. Carton packed.Warning: If these bits are used in an SDS hammer drill, it must have an electronic safety clutch and only be used in rotary mode.5010559437122PartNo-DCB/BDraper 43712