Tiger Brand Js-36 Adjustable Jack Post

1′ 7 inch To 3′, 15 Gauge Adjustable Jack Post, Max Ext Load 16,000 LBS, Min Ext Load 18,000 LB, Additional Support For Crawl Spaces, Attic, Staircase Or Decks, Adjusts With 3/4 inch Wrench, O.D. Gauge & Tube Dim 2-1/4 inch x 15 Gauge x 17 inch, Screw Size 1 inch x 7 inch, -5 Thread Support, Collar Size 2-1/4 inch x 1/2 inch, Support Pins 1/2 inch x 3 inch, 13 Gauge Plate Size 4 inch x 5 inch, Corrosion Resistant Inside & Out, Double Carriage Bolt & Nut, Zinc Coated, For Added Safety, Heavy Plates Suited For Wood & Steel, Deep Dish Self-Centering Plates. Size: 1′ 7 – 3′.