A cutting tool (10) comprises an elongate housing (12) adapted to slidably receive a cutting blade (14) therein. The cutting tool (10) is in the form of an attachment for an electric jigsaw (not illustrated) and the housing (12) therefore incorporates a pair of clamping brackets (15) for mounting the housing on a footplate of the jigsaw. Each bracket (15) is provided with a mounting flange (16) adapted to clamp onto the footplate of the jigsaw when a compressive force is applied to move the clamping brackets towards each other. The cutting blade (14) is driven by the jigsaw in a reciprocating manner similar to a conventional jigsaw blade. A workpiece support (30) extends from a free end (22) of the housing, and has a support member (32) arranged to engage a workpiece in a stabilising manner adjacent the free end (22) of the housing (12) when the cutting through the workpiece in use. Support member (32) is fixed to a guide member (36) which extends parallel to and adjacent the cutting plate (14) where it protrudes from the free end (22) of the housing (12). The guide member (36) is of approximately the same thickness or slightly thinner than the cutting blade and is arranged to pass through a cut formed by the cutting blade (14) in use.