INTENDED USE:For heavy duty truck, agriculture, construction, mining, mobile home, oil field, automotive, and marine applications where lifting, pushing, spreading, bending, pressing, or straightening are required.FEATURES:Two piece zinc plated handle.Prevent rust with ?Parkerized? pump piston, ram and extension screw.No leak ?Uniweld? construction.State of the art design reduces repair time.Longer wear life due to internally machined oil passages, smooth bearing surfaces andclose tolerances.Lightweight forged base provides more steel only where strength is required.The heavy-duty release valve was designed to eliminate parts and reduce the chances of breakage and excessive wear.Safety bypass and overload systems prevent cylinder damage and prevent the jack from being used beyond the ASME/PASE load-limiting standard.