Ball Bur SD Cut Type Single Shank Dia 1/8 in Head Dia 1/4 in Head Length 1/4 in Included Angle Not Applicable Overall Length 1-3/4 in Trade Number SD-51 Primary Material Application Cast Iron Non-Ferrous Metals Steel Head Shape Ball Operating Speed - Maximum 70 000 RPM Coating Bright (Uncoated) Head Material Carbide Head Material Grade C2 Submicron Shank Material Steel