Abstract: A guide for a mitre saw is described which includes a base having a face with a first side edge, a second side edge, a first edge and a second edge. A guide member is pivotally mounted to the face of the base. The guide member can be locked to the base in a preselected angular position. A telescopic member is secured to the guide member for co-axial telescopic movement. The telescopic member has a mounting pin. A ruler having an elongate mounting slot is telescopically received on the mounting pin. The ruler is movable relative to the mounting pin toward the first side edge and the second side edge of the base within limits defined by the elongate mounting slot. The ruler can be locked to the telescopic member such that the positioning of the telescopic member determines the position of the ruler relative to the first edge and the second edge of the base.