Inverted Cone Bur End Type Flat Cut Type Double Shank Dia 1/4 in Head Dia 1/4 in Head Length 5/16 in Included Angle 10 Degrees Overall Length 2 in Trade Number SN-1 Head Shape Inverted Cone Operating Speed - Maximum 70 000 RPM List Number 852 Coating Bright (Uncoated) Head Material Carbide Shank Material Carbide