These Vevor RV scissor jacks provide up to 9000 lbs of support to help keep your RV stable and level on uneven ground. The set includes four heavy-duty steel jacks with a lifting range from 4" to 23.4" for versatile setup. An electrophoretic anti-rust coating helps them stand up to outdoor conditions. The included hand crank and socket make operation easier, while magnetic bubble levels help with accurate leveling. Designed for Class B, C, and D RVs, trailers, and camping vans.