This Starrett BMKIT1 Diamond Dri-Core Drill Set built for intensive dry cutting on brickwork and blockwork. Ideal for plumbers, electricians and other installation engineers. Dri-Core drills provide a faster rate of cut than Tungsten Carbide Tipped (TCT) alternatives, with less pressure required. Supplied in a handy carry case. Contains: 5 x Diamond Dri-Core Drill Bits:38mm (1.1/2in), 52mm (2.1/16in), 65mm (2.9/16in), 117mm (4.9/32in), 127mm (5in). 1 x BMA1 Short Standard Hexagon Adaptor. 1 x BMA2 Short Standard SDS Adaptor. 1 x BMA1240 Hexagon Adaptor (240mm long). 1 x BMA2240 SDS Adaptor (240mm long). 1 x BMA3200 Pilot Drill 13 x 200mm. 1 x BMA5 Drift Key.