Abstract: A portable power tool having a sole plate for contacting a workpiece along which a straight line is to be cut has an attachment for the sole plate which includes means for supporting a guiding means which is adjustable with respect to the supporting means to cooperate with a longitudinal guide member releasably attached to the workpiece. The guide member may be angle iron, channel iron, I-beam or other similar configuration conveniently available to a workman and not especially designed to be used with the attachment.