Ball Bur SD Cut Type Single Shank Dia 1/4 in Head Dia 3/4 in Head Length 3/4 in Included Angle Not Applicable Overall Length 2-7/16 in Trade Number SD-7 Primary Material Application Cast Iron Non-Ferrous Metals Steel Head Shape Ball Operating Speed - Maximum 33 000 RPM Coating Bright (Uncoated) Head Material Carbide Head Material Grade C2 Submicron Shank Material Steel