The CorePlus Diamond Dry Core Drill Bits professional quality core construction plus performance features deliver a smooth drilling experience. 1 x 38mm Core bit 1 x 52mm Core bit 1 x 65mm Core bit 1 x 117mm Core bit 1 x 127mm Core bit 1 x A-taper pilot drill 10 x 200mm 1 x SDS-plus extension adaptor 10 x 240mm 1 x SDS-plus extension adaptor 10 x 115mm 1 x Hex extension adaptor 12 x 240mm 1 x Hex extension adaptor 12 x 88mm 1 x Extractor drift key. 8mm diamond segments with a high concentration of premium grade diamond in the bond. Leading-edge diamond/metal bonding metallurgy for long-lasting core life. Latest’V’ groove segment design enables fast clearing of debris allowing a continuous fast cutting action. Ribbed core body further aids the clearing of waste debris. Aerated core design enhances cooling and extends core life. 1/2in BSP threaded compatable with standard core drilling machines and accessories.