1/4 in, Head Dia. 5/8 in, Length of Cut 9/16 in, Overall Length 2-3/8 in, Trade Number SD-6, Abrading Application Build Up Welding Preparation, Contouring, Hole Deburring, Metalworking, Coating Bright (Uncoated), Head Material Carbide, Head Material Grade C2 Submicron Carbide Bur,Ball Shape,5/8 In,1/4 Shank.