Ball Bur SD, Type Double, Shank Dia. 1/4 in, Head Dia. 3/16 in, Head Length 3/16 in, Included Angle Not Applicable, Overall Length 2 in, Trade Number SD-14, Head Shape Ball, Operating Speed - Maximum 75,000 RPM, List Number 808, Coating Bright (Uncoated), Head Material Carbide, Shank Material Carbide