Ball Bur SD, Type Single, Shank Dia. 1/4 in, Head Dia. 3/8 in, Head Length 3/8 in, Included Angle Not Applicable, Overall Length 6 in, Trade Number SD-3L6, Head Shape Ball, Operating Speed - Maximum 63,000 RPM, List Number 968, Coating Bright (Uncoated), Head Material Carbide, Shank Material Hardened Steel