PFERD Carbide Burr, Premium Grade, Series: High Performance Line, 1/2 in Head Dia, 7/16 in Length of Cut, 2-3/16 in Overall Length, Ball Head Shape, Aluminum Cut Type, 1/4 in Shank Dia, 1-3/4 in Shank Length, Tungsten Carbide Head, HC-NFE Black-Gray Head Coating, 30000 rpm Maximum, Applicable Materials: Aluminum, Non-Ferrous Metals and Plastics, SD-5 Industry Specification