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ST-901 with Vee Head The Heavy Duty Jack is the first commercially produced Jack stand constructed of rugged 1in 2.5 cm steel tubing tested by independent labs for excessive loads. Replacement leg feature for easy repair. Vee-Head for general welding of pipe shapes solids and rounds. Strut tension plate for superior lateral support. Built for heavy use abuse. Quick-action lock washer for fast height positioning. Patented Fall Guard feature allows 1 inch 25 mm safety zone around lock washer. 1-1/2 inch 38 mm Acme fine adjustment thread the largest in the industry. Large convenient adjustment handle. Set screw for double margin of safety. Set screw can lock jack head to stand for transportation no loose pieces. Jack independently load tested for quality assurance. CE rated. Backed by over forty years of jack stand manufacturing experience.