Cut-off machines (sometimes called cut-off saws) use a continuous-rim abrasive blade used to cut metal alloys and other hard materials that cannot be cut using a toothed blade. The blade produces sparks as the workpiece is cut and causes heat buildup in the workpiece that can cause burrs and a buildup of molten slag on the edge of the blade. These saws have a higher rpm than chop saws and make straight and angled cuts. They are used in metal fabrication, machine shops, and maintenance applications.