Specifications: For standard dressed 4" x 4" lumber. - Material: 4" x 4" x 5" Square Tubing, 1 1/2" x 6 1/2" Acme Threads. - Overall length when screwed down is 15 inches measured from top to bottom. - Fully extended allowable load of 4" x 4" Screw Jack:15,00 lbs.
