Carbide Nugget Burrs Shape wood quickly, without the clogging and deep scratches left by other bonded carbide burrs! These burrs are made of virtually indestructible carbide on 1/8-inch steel shanks. There are 6 favorite carving shapes that won’t wear out, load up, break down, or overheat. Use to shape all woods, plastic, fiberglass and ceramics (Not for use on metal). Maximum speed 30,000 rpm. Shanks: 1/8”, Length: 1.5”. Made in USA. Note: Available in Coarse and Medium grits (Medium grit is pictured).