SGS Pro® Carbide Burr, Imperial, Series: Universal SD, Radius, 1/4 in Head Dia, 7/32 in Length of Cut, 2 in Overall Length, Ball Head Shape, Double Cut Type, 1/4 in Shank Dia, Solid Carbide Head, 55000 rpm Maximum, Applicable Materials: Ferrous and Non-Ferrous Metals, SD-1 Industry Specification