Carbide Bur End Type Cut Cut Type Aluminum Shank Dia 1/4 in Head Dia 1/2 in Head Length 1 in Included Angle Not Applicable Overall Length 2 3/4 in Trade Number SB-5NF Primary Material Application Zinc Head Shape Cylinder Operating Speed - Maximum 50 000 RPM List Number 310B System of Measurement Inch Coating Bright (Uncoated) Head Material Carbide Head Material Grade C2 Submicron Shank Material Steel