4 Pack Long Extended Reach Swing Down Jacks - 1000 lb Capacity Per Jack - Spring Loaded - Black Powder Coated to Resist Rust Folds down and telescopes for longer distances - Positive ratchet locking holds load without slipping NO Ratchet bar - No Mounting Hardware you will need to provide - Can be Bolted or Welded to Frame Retracted Length 16" Fully Extended Length 22 1/2" Telescoping Travel 6 1/2" Base Plate 3 3/8” W x 4" L Mounting Area 1 7/8” W x 4" L Best used with pop-up campers, utility trailers, cargo trailers, and motorcycle trailers. WARNINGS Do Not screw these down, screws will work their way loose or be pulled out. Do Not use jack to lift excessive weight or tires off the ground. Jack is made to stabilize your unit, not lift unit off the ground. Vehicle frame and door jamb damage may result. Do Not use jack as a tire changing jack.