Carbide Bur Grobet Made In U.S.A. Tree Radius 3/8X3/4X1/4 Aluminum Cut SAVE $$$ BY CHECKING HOW LONG OURS LAST VS. THEIRS!!!! Dimensions shown are in the following sequence: Head diameter, head length, shank size. ALUMINUM CUT: (AC) is for use on aluminum, magnesium, soft steel and non-ferrous materials such as hard plastic, rubber and wood. Provides easy chip flow and faster stock removal with little or no clogging.