Abstract: A hand-held cutter especially for mat or foam board comprises a body, with handle, carrying a sliding blade holder so that a cutting blade mounted on it can be extended for cutting, or withdrawn for safety when not in use; the holder is adapted to carry two parallel, spaced-apart blades when it is desired to make two parallel cuts in a board, and the body has an inclined-plane nose so the region between the two cuts can be "plowed out" to form a channel for receiving another piece of foam board. Each blade is mounted on an outboard side of the body so the blade and cut line can be easily seen during use. A clip-on angulation device is provided which, when clipped onto the bottom of the main body, provides an angled guide surface on which the body can be slid, when an angled cut is desired.