Carbide Bur End Type Radius Cut Type Steel Shank Dia 1/4 in Head Dia 3/8 in Head Length 5/16 in Included Angle Not Applicable Overall Length 2 1/16 in Trade Number SD-3 Primary Material Application Cast Iron Steel Head Shape Ball Operating Speed - Maximum 24 000 RPM System of Measurement Inch Coating Bright (Uncoated) Head Material Carbide Shank Material Steel