Inverted Cone Bur End Type Flat Cut Type Double Shank Dia 1/4 in Head Dia 3/8 in Head Length 3/8 in Included Angle 13 Degrees Overall Length 2 in Trade Number SN-2 Head Shape Inverted Cone Operating Speed - Maximum 63 000 RPM List Number 852 Coating Bright (Uncoated) Head Material Carbide Shank Material Hardened Steel