Ball Bur SD Cut Type Double 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 Shank Length 6 in Operating Speed - Maximum 63 000 RPM List Number 868 Coating Bright (Uncoated) Head Material Carbide Shank Material Hardened Steel