Carbide Bur End Type Radius Cut Type Aluminum Shank Dia 1/4 in Head Dia 1/4 in Head Length 7/32 in Included Angle Not Applicable Overall Length 2 in Trade Number SD-1NF Primary Material Application Zinc Head Shape Ball Operating Speed - Maximum 65 000 RPM List Number 310D System of Measurement Inch Coating Bright (Uncoated) Head Material Carbide Head Material Grade C2 Submicron Shank Material Carbide