It is 4.5" in length for hard to reach areas and should not exceed a maximum of 20,000RPM. Set includes SA-5: Cylindrical Shape 1/2" x 1"; SC-3: Cylindrical Radius End 3/8" x 3/4"; SD-3: Ball Shape 3/8"; SF-3: Tree Shaped Radius End 3/8" x 3/4"; SF-5: Tree Shaped Radius End 1/2" x 1".
