4'5-7'9 15GA Jack Post

4' 5" To 7' 9", 15 Gauge Adjustable Jack Post, Max Ext Load 11,350 LB, Min Ext Load 18,000 LB, 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 45-1/2", 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.