A die grinder is a handheld power tool used for grinding, sanding, honing, polishing, or machining material, typically metal, but also plastic or wood. It features a spinning spindle that can hold a die grinder bit. Die grinders are versatile tools that can be used for various tasks, including metalworking, woodworking, plastics, and auto body care. They are commonly used in the automotive and construction industries for their versatility and convenience in performing complex operations such as smoothing weld seams or removing rust on metal surfaces. Die grinders typically rotate at a high speed, typically 25,000 RPM or more. They can be operated by compressed air or electricity. Die grinders are useful for hundreds of cutting needs, from sculpture-like contouring in the absence of CNC, to cut-off of bar stock, to any of the cutting and grinding needs of fabrication, such as in the work of welders, boilermakers, millwrights, ironworkers (steel erectors), sheet metal workers (such as auto body workers and HVAC technicians), to woodworking (especially cabinet making), hacking, and others.