Ball Bur SD, End Type Radius, Type Single, Shank Dia. 1/8 in, Head Dia. 3/16 in, Head Length 5/32 in, Included Angle Not Applicable, Overall Length 1 1/2 in, Trade Number SD-53, Primary Material Application Cast Iron, Ferrous Metals, Non-Ferrous Metals, Steel, Head Shape Ball, Shank Length 1 11/32 in, Operating Speed - Maximum 40,000 RPM, Compatible Tool Type Die Grinder, Rotary Power Tool, Straight Grinder, Head Material Carbide, Head Material Grade YK15, Shank Material Carbide