BAL 20-inch Light Trailer Stabilizing Jack is recommended For use on tent trailers, lightweight travel trailers and fifth wheels with up to 16-inch of frame-to-ground clearance. Set of two jacks with handle. Bolt-on application, mounting hardware included. Coated to prevent rust. 17-inch (19-inch) maximum jack extension (frame to ground). Replacement for Atwood, Fulton and other non-screw corner stands.