Inverted Cone Bur End Type Flat Cut Type Single Shank Dia 1/8 in Head Dia 1/4 in Head Length 1/4 in Included Angle 10 Degrees Overall Length 1 1/2 in Trade Number SN-51 Head Shape Inverted Cone Operating Speed - Maximum 70 000 RPM List Number 915 Coating Bright (Uncoated) Head Material Carbide Shank Material Hardened Steel