Product Feature High product processing quality, high finish, can process out a various of high-precision mold cavity Heavy duty rotary rasp set for power drills, air tools, and die grinders. Use fore grinding, polishing, carving, and burnishing wood surface The most commonly-used rasp configurations and styles: 1/4″ shanks to fit most electric and cordless drills Carbon steel High-carbon steel tempered and hardened for long-life cutting power, makes all you are grinding needs easier and more convenient Made from high quality Carbon steel High-carbon steel tempered and hardened for long-life, use for grinding, polishing, carving, burnishing wood surface Product Specification Material: 45# steel Color: Black Size: Shank diameter: 1/4″ Weight: 90g Product TypeConsumerElectronics Package Included 5 x Steel Rotary Burr.