TheEdgepoint Diamond Dry Core Bit Set CDU contains 3 xEdgepoint Diamond Dry Core Bit Set, 7 Piece.Edgepoint Diamond Dry Core Bits deliver a smooth drilling experience. The 8mm diamond segments feature a high concentration of premium-grade diamond in the bond, utilising leading edge diamond/metal bonding metallurgy, for long-lasting core life. Fitted with a 1/2in BSP thread, compatible with standard core drilling machines and accessories.Each set comes in a sturdy aluminium storage case, contains:3 x Core Bits: 38, 52, 117mm1 x A-taper Pilot Drill 10 x 200mm1 x SDS-plus Extension Adaptor 10 x 200mm1 x Hex Extension Adaptor 12 x 200mm1 x Extractor Drift Key