YXGJDP Confezione da 2 Cric a Pavimento Regolabile da 4" a 7",Mini Cric a Vite,Supposta Regolabile...

Easy To Use:These house leveling jacks are easy to install and adjust, designed to stabilize and support beams and joists during construction and repairs. Application Scenario: Old houses and natural disasters often cause floor joists to crack, support beams to rot, and porches or decks to sag.

eBay