1/4 in, Length of Cut 3/16 in, Overall Length 1-11/16 in, Trade Number SB-51, Abrading Application Metalworking, Peripheral and Face Milling, Coating Bright (Uncoated), End Type Flat End, Head Material Carbide Carbide Bur,End Cut,1/4 In,1/8 Shank.1/8 in, Head Dia.