wolfcraft mounted grinding points are made from high quality brown Aluminum Oxide in a vitrified bond. Use to debur, grind, form, groove, and shape all kinds of metals, steel, hardened steel, ceramics and wood. The round 1/4-inch shank and high RPM tolerance allows this point to be used in high-speed pneumatic tools, like die grinders. The point has good dimensional stability and long service life, and can be used economically with lower RPM tools.