THIS TREE SHAPED CARBIDE BURR/ROTARY FILE HAS A 1/4"CUT DIAMETER AND A 5/8" CUT LENGTH. THE WIDE FLUTES PREVENT ALUMINUM AND OTHER SOFT MATERIALS FROM BINDING TO THE BURR AND FOULING IT. THESE BURRS ARE USED IN ELECTRIC , PNEUMATIC, AND HYDRAULIC DIE GRINDERS. BURRS ARE ESSENTIALLY POWER FILES WHICH CAN GRIND IN TIGHT SPACES WITH PRECISION FOCUS. THEY ARE USED BY MECHANICS, MACHINISTS, TRADESMEN, AND HOBBYISTS.