Jack Post, 15-Gauge, Adjusts From 4' 5" To 7' 9"

4' 5" To 7' 9", 15 Gauge Adjustable Jack Post, Max Ext Load 11,350 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 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 And Steel, Deep Dish Self-Centering Plates.