CGW Flex-Hone Wheel Brush, Long Shank, Radius End, 3/8 in Diameter Head, 3/4 in Length of Cut, 6-3/4 in Overall Length, Cylindrical – Radius End Shape SC Head Shape, Double Cut Cut, 1/4 in Shank Diameter, Carbide Head, 50000 rpm Maximum, Applicable Materials: Cast Iron, Copper, Ferrous Metals, Fiberglass, Hard Rubber, Iron Alloys, Plastic, Nickel, Stainless Steel and Titanium, Industry Specification: SC-3L6