5/16"-CUT DIAMETER X 3/4"-CUT LENGTH FLAME SHAPED CARBIDE BURR. THIS DOUBLE CUT BURR IS DESIGNED TO GRIND FERROUS AND OTHER HARD METALS. THEY ARE USED IN ELECTRIC , PNEUMATIC, AND HYDRAULIC DIE GRINDERS. THESE BURRS ARE ESSENTIALLY POWER FILES WHICH CAN GRIND IN TIGHT SPACES WITH PRECISION FOCUS. THEY ARE USED BY MACHINISTS, MECHANICS, TRADESMEN, AND HOBBYISTS.