Abstract: A guide for guiding a power tool such as a circular saw has a planar deck, and two shoulders extending from opposed edges of the deck in diametrically opposite directions. The deck is provided with mounting fasteners for securely attaching the saw to the guide. There is an aperture in the deck for receiving the circular saw, the aperture being off center. By attaching the power tool to opposite sides of the guide it is possible to obtain straight cuts of different widths.