1' 7" to 3', 15 gauge adjustable Jack post, Max ext load 16,000 lbs, min ext load 18,000 lbs, additional support for crawl spaces, attic, staircase or decks, adjusts with 3/4" wrench, O.D. Gauge & tube dim 2-1/4" x 15 gauge x 17", screw size 1" x 7", -5 thread support, collar size 2-1/4" x 1/2", support pins 1/2" x 3", 13 gauge plate size 4" x 5", corrosion resistant inside & out, double carriage bolt & nut (zinc coated) for added safety, heavy plates suited for wood & steel, deep dish self-centering plates. This product adds a great value. Product is highly durable and very easy to use. This product is manufactured in United States.