The CorePlus Diamond Dry Core Drill Bit delivers a smooth drilling experience. Its 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. A ribbed core body and V-groove segments enable the fast clearing of debris allowing for a continuous fast cutting action while the aerated core design enhances cooling and extends core life. 1/2in BSP threaded compatible with standard core drilling machines and accessories. Please Note: 22mm and 28mm have a 10mm Hex Shank and do not require an arbor accessory.This 7 piece CorePlus Diamond Dry Core Drill Bit Set is supplied in a sturdy aluminium storage case. Contains: 3 x Diamond Dry Core Drill Bits: 38 52 and 117mm 4 x AccessoriesPTDCORDCDKIT7