SGS Pro® Carbide Burr, Imperial, Series: Universal SD, 3/8 in Head Dia, 5/16 in Length of Cut, 2-1/16 in Overall Length, Ball Head Shape, Coarse Cut Cut Type, 1/4 in Shank Dia, Solid Carbide Head, Applicable Materials: Brass, Copper, Zinc, Plastics and Hard Rubber, SD-3 Industry Specification