This TCT cutter bit is designed for use with Faithfull Box Cutters to form recesses for either single or double electrical back boxes. It cuts 77mm round holes in block, soft brick and concrete. The cutter has precision machined cutting edges and is designed for use with 2kg SDS Plus rotary hammer drills. Cutter Bit Size: 77mmContains:1 x SDS Plus shank drill 8 x 160mm.1 x SDS Plus flat chisel 20 x 140mm. Features: Labour and time saving system Precision machined cutting edges cut 77mm round holes in block, soft brick and concrete Precision machined cutting edges cut 77mm round holes in block, soft brick and concrete For use with 2kg SDS Plus rotary hammer drills Includes: SDS Plus shank drill 8 x 160mm and flat chisel 20 x 140mm Specifications: Dimensions: H:18.2 x W:8.4 x D:8.4 cm Colour: Multi Guarantee:5 years Material: Tungsten Carbide Model Number: FAISDSBOXCUT