Carbide Burr Set, 6 in. L x 1/4 in. D, Maximum RPM: 20, 000, Includes:, (1) 3/8 in. x 3/4 in. Cylindrical, (1) 3/8 in. x 1 in. Cylindrical, (1) 3/8 in. x 3/4 in. Tree, (1) 3/8 in. x 3/4 in. Tree Radius End, (1) 3/8 in. Ball|JEGS Die Grinding Carbide Burr Set [6 in. Long].