A metal abrasive tool fitted with a replaceable blade. As a wood plane is comparable to a shaving razor, a surform is much like a food grater. It allows small particles of material to pass through it without clogging its cutting teeth. Although only one model is shown here (in two positions), surforms are available in a number of sizes and shapes; flat and curved.Also see carve, file, gouge, plaster, rasp, and riffler.