4 Trailer Jacks w/ Square Tubular Swivel Mount Topwind with extensions and 3/4" thick base plates. Not pretty but work well. Lubed screws and bearings. 10"-20" lift. 9"×9" mounting plate with 7/8" holes 5" on center. Base plates are 18" wide. These were used as outriggers on a trailer with a hydraulic lift. Lift your deck, shed or whatever. Can deliver in the Wasilla area.