This simple to use scissor jack set stabilizes your RV or trailer when it's in need of a fix. Bolt the jack underneath the front or rear of your vehicle and use the manual crank handle to securely raise or lower your RV off of the ground. It features a compact and portable size that's convenient to store while you're on the road. The height easily adjusts from 4 inches minimum to 27 inches maximum. It also includes an extra replacement screw so you'll be able to repair your RV even if the first screw is lost or replaced.