Ball Bur SD Cut Type Single Shank Dia 1/4 in Head Dia 1/2 in Head Length 1/2 in Included Angle Not Applicable Overall Length 6 in Trade Number SD-5L6 Head Shape Ball Operating Speed - Maximum 50 000 RPM List Number 968 Coating Bright (Uncoated) Head Material Carbide Shank Material Hardened Steel