SGS Pro® Carbide Burr, Imperial, Series: Universal SD, Radius, 1/2 in Head Dia, 7/16 in Length of Cut, 2-1/8 in Overall Length, Ball Head Shape, Double Cut Type, 1/4 in Shank Dia, Solid Carbide Head, 28000 rpm Maximum, Applicable Materials: Ferrous and Non-Ferrous Metals, SD-5 Industry Specification