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These dry diamond core bits are of superior design and high quality manufacture. They are suitable for use on lightweight building materials, ordinary facing brickwork and blockwork up to 10N/ sq mm. These cores give rapid, clean service entries with virtually no making good required. The cores thread onto an adaptor, either with a SDS or Hex shank to suit your drill chuck. The adaptor can be fitted with a pilot drill to guide the core. For deep holes, a 200mm extension adaptor is available. For maximum safety and efficiency use a drill of at least 850W with a rigid side handle and fitted with an integral slipping clutch. Cores are only to be used with non-hammer drills or with the impact switched off.