In fabrication, machine shops, and automotive applications, chop saws, cut-off machines, and cold saws cut metal and plastic. Cold saws are used in high-volume cutting applications and employ coolant to keep the blade and workpiece cool, extending blade life and preventing grain alteration or oxidation. A continuous-rim abrasive blade is used in cut-off machines to cut metal alloys and other hard materials that cannot be cut with a toothed blade. A toothed blade is used in chop saws. They have a lower rpm and less sparking than cut-off saws, resulting in less heat accumulation in the blade and workpiece.