Warning: these jacks are from Libra Trailer Parts only, our jacks has passed industrial standard testing, all other sellers under this listing actually selling different jacks, beware of cheap jacks! These 4 leveling scissor jacks with 5,000-lb capacity each will keep your RV level and stable. Each adjusts from 4″ to 24″ inches as your situation requires, and the bow-tie base steadies the jack on soft surfaces. Features: Raises, lowers and stabilizes camper Remains steady on soft surfaces because of wide bow-tie base Bolts or welds on, Includes 4 steel jacks and 1 crank handle Specs: Capacity: 5,000 lbs per jack (Min. breaking strength) Extended height: 24″ Retracted height: 4″ These stabilizer jacks are only used on RV/trailers for stabilizing and leveling purpose. Never use for lifting, changing tires or supporting weight of any vehicles, the vertical static load should never exceed 1/3 of the rating. Improper use can result in property damage, serious injury or death.