Adjustable height jacks use threaded screw posts to enable precise height changes and fit floor supports or porch elements to the contours of a structure. With a usable range from about 4.7 to 6.5 in. they support leveling and load distribution across beams and floors, stabilizing sagging areas where straight alignment matters. These posts are suited for construction tasks and repair work, including leveling beams, stabilizing stairs, and providing temporary roof support during renovations, as well as set ups for mobile homes or deck projects. A light application of grease on the threads can improve smoothness during adjustment and reduce resistance when fine tuning height. Maximum height is 6.5 in. and if higher lift is required you would work with other jack models designed for larger ranges rather than overextending a single post. For installation, rotate the base and top plates to the desired height, position the jack at the intended location, and then secure by raising with threaded adjusters. Finally, tighten the nuts on both ends to stabilize the struts and prevent wobble. These screw jacks can function as either temporary or permanent supports in crawl spaces, attics, ceilings, patios, stairs, and floor systems within their range, emphasizing leveling, shoring, and beam tightening rather than large lifts.