General description This 7 piece CorePlus Diamond Dry Core Drill Bit Set is supplied in a sturdy aluminium storage case. It includes 3 Diamond Dry Core Drill Bits with diameters of 38mm, 52mm, and 117mm, along with 4 accessories. The CorePlus Diamond Dry Core Drill Bit is designed to deliver a smooth drilling experience. Technical specifications Diamond segment thickness: 8mm Drill bit sizes: 38mm, 52mm, 117mm Thread type: 1/2in BSP Hex shank sizes: 22mm and 28mm have a 10mm Hex Shank Compatibility and accessories Compatible with standard core drilling machines and accessories 22mm and 28mm bits do not require an arbor accessory Usage Designed for dry core drilling Fast clearing of debris for continuous cutting action Aerated core design enhances cooling and extends core life