Ball Bur SD Cut Type Single Shank Dia 1/4 in Head Dia 1/2 in Head Length 7/16 in Included Angle Not Applicable Overall Length 6-7/16 in Trade Number SD-5L6 Primary Material Application Cast Iron Non-Ferrous Metals Steel Head Shape Ball Operating Speed - Maximum 50 000 RPM Coating Bright (Uncoated) Head Material Carbide Head Material Grade C2 Submicron Shank Material Steel