1/4 in, Length of Cut 1/2 in, Overall Length 2 in, Trade Number SC-51, Abrading Application Metalworking, Surface Milling, Contouring, Coating Bright (Uncoated), End Type Radius End, Head Material Carbide Carbide Bur,Radius End,1/4 In,1/8 Shank.1/8 in, Head Dia.