Ideal for plumbing, heating and electrical specialists, the Marcrist PC850 3 Core Extreme Speed Dry Diamond Core set includes three diamond core drill bits, a pilot drill, drift key, 3 jaw chuck adaptor, extension rod and an aluminium carry case. Suitable for Concrete products, Non-reinforced concrete, Bricks, London bricks, Concrete pipes, Building materials, Calcareous sandstone, Poroton, Natural Stone. Specifications • Core Length: 165mm • Segment Height: 8mm Features and Benefits • Includes three common diamond core sizes • Suitable for dry drilling hard materials • Fast, efficient and long life • Low cost per hole with minimal drilling residue • Aluminium case for transport and storage Contents • 38mm Core Bit • 52mm Core Bit • 117mm Core Bit • 200mm Pilot Drill • Drift Key • 3 Jaw Chuck Adaptor 1/2" (M) • Extension Rod • Carry Case