For use with round cutter to form recesses for electrical back boxes. Labour and time saving system designed to cut sockets in blockwork and brick walls for the siting of electrical back boxes. Not suitable for concrete Used in conjunction with lightweight 2kg SDS fixing hammers with a rotation stop function. The system requires the use of a FAISDSBOXCUT circular cutter and either a FAISDSBOXSML* or FAISDSBOXLRG* depending on the box size to be cut. Size: 77 x 154mm (Double Box)