Draper Diamond Core Bit, 28 x 300mm DR-43709Manufactured 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.5010559437092PartNo-DCB/BDraper 43709