Stabilize your step assembly as you enter and leave your coach. Steel jack easily supports 750 lbs., taking the load off your step tread, mechanism and frame. Lengthens the life of any RV step assembly. Just twist to extend or retract for storage. Turn the threaded rod at least three full thread turns into the base for proper support. | Stromberg Carlson Stabil-Step Jack, 8" - 14"