FUNCTIONAL USE: Floor jacks provide perfect support for flat floors and basement construction, and are often used in house basement repairs. This jack is suitable for basement beams, sagging floors, stairwells, farms, walls, cellar ceilings, underpasses, basements, underground bunkers EASY TO INSTALL: This product has an adjustment range of 20"-33", and the adjustable jack comes with dual bracket locks for extra strength and security. Just turn the adjusting nut to easily raise the height you need. DURABLE CONSTRUCTION: Made from sturdy steel with a corrosion-resistant coating, this jack can support up to 5,500 lbs. Home Leveling Adjustable Post Jack Temporarily Fixes Weak Floors, Cellar Ceilings, Underpasses, Basements, Underground Bunkers Basement Floor Jack 20" - 33" Adjustable Jack Adjustable Support Beam House Jack Post - Suitable for cellar ceilings, underground passage, basements, underground bunkers