Carbide Bur End Type Radius Cut Type Aluminum Shank Dia 1/4 in Head Dia 3/8 in Head Length 3/4 in Included Angle Not Applicable Overall Length 2 1/2 in Trade Number SF-3 Head Shape Tree Operating Speed - Maximum 66 000 RPM List Number 1848 System of Measurement Inch Coating Bright (Uncoated) Head Material Carbide Shank Material Hardened Steel