3/8 in, Length of Cut 3/4 in, Overall Length 2-1/2 in, Trade Number SB-3, Abrading Application Metalworking, Peripheral and Face Milling, Coating Bright (Uncoated), End Type Flat End, Head Material Carbide Carbide Bur,End Cut,3/8 In,1/4 Shank.1/4 in, Head Dia.