Inverted Cone Bur End Type Flat Cut Type Double Shank Dia 1/4 in Head Dia 1/2 in Head Length 1/2 in Included Angle 28 Degrees Overall Length 2 in Trade Number SN-4 Head Shape Inverted Cone Operating Speed - Maximum 50 000 RPM List Number 852 Coating Bright (Uncoated) Head Material Carbide Shank Material Hardened Steel