A power tool including a housing for an electric motor and a mounting for a disc having a housing, wherein the motor is arranged to drive the saw blade about its axis. The housing includes at least one guard member covering a peripheral portion of said disc and a debris conduit allowing removal of debris from the disc during use in a first cutting mode. A removable member is attachable to the housing to selectively block the debris conduit such that the tool can be used in a second cutting mode.