Carbide Bur End Type Radius Cut Type Steel 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 Primary Material Application Cast Iron Steel Head Shape Tree Operating Speed - Maximum 55 000 RPM System of Measurement Inch Coating Bright (Uncoated) Head Material Carbide Shank Material Steel