Tiger Brand 1.7 Ft. to 3 Ft. 15-Gauge Adjustable Jack Post

1 Ft. 7 In. to 3 Ft. 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 In. Wrench, OD Gauge & Tube Dim 2-1/4 In. x 15-Gauge x 17 In., Screw Size 1 In. x 7 In., Thread Support, Collar Size 2-1/4 In. x 1/2 In., Support Pins 1/2 In. x 3 In., 13-Gauge Plate Size 4 In. x 5 In. Corrosion-Resistant Inside & Out, Double Carriage Bolt & Nut (Zinc Coated) For Added Safety, Heavy Plates Suited For Wood & Steel, Deep Dish Self-Centering Plates.