1/2"- CUT DIAMETER X 1"-CUT LENGTH, TREE (RADIUS END) CARBIDE BURR/ROTARY FILE. 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.