Ball Bur SD Cut Type Double Shank Dia 1/8 in Head Dia 1/4 in Head Length 1/4 in Included Angle Not Applicable Overall Length 1 1/2 in Trade Number SD-51 Head Shape Ball Operating Speed - Maximum 70 000 RPM List Number 815 Coating Bright (Uncoated) Head Material Carbide Shank Material Hardened Steel