These SC Style Alumi-Cut burrs are the best you can buy for non ferrous metals, period. Ground from solid micro-grain carbide and CRYG treated. Unbelievable product for deburring non ferrous metals like aluminum, brass, plastics etc. 3/8″ and 1/2″ Diameters Available. Cylindrical shape like a barrel with a Ball Nose, on a cut down 1/4″ shank. Available in Alumi-cut, sub Micro-grain carbide. Also available in Extended lengths. Call 1-800-350-8665 Ext 100