The Forney 60124 Tungsten Carbide Burr offers precision deburring, sculpting and material removal in hard-to-reach areas thanks to its shank-mounted double cut design. This burr is perfect for ferrous metals, plastic, fiberglass and other machinable materials with a 1/4-inch (6.35mm) shank and tree radius (SF-1) shape and can run at speeds up to 70,000 RPM.