Inverted Cone Bur End Type Flat Cut Type Double Shank Dia 1/4 in Head Dia 5/8 in Head Length 3/4 in Included Angle 18 Degrees Overall Length 2 in Trade Number SN-6 Head Shape Inverted Cone Operating Speed - Maximum 40 000 RPM List Number 852 Coating Bright (Uncoated) Head Material Carbide Shank Material Hardened Steel