Got an RV with a slide-out room? You know that feeling when it's extended and feels a bit wobbly? These LIBRA stabilizer jacks are designed to fix that. This set includes two super sturdy jacks, each with a massive 5,000-pound capacity. They're specifically for providing support and stabilizing your RV's slide-out when it's extended – NOT for lifting the vehicle or changing tires. The best feature is the 'Quick Lift' mechanism. Instead of cranking for ages by hand, you can use a standard 3/4\ socket with a power drill (or the included hand crank if you prefer) to raise the jack foot quickly and easily. They adjust from a low height of 16 inches up to 28 inches, so they should fit a wide range of RVs. The construction is heavy-duty steel with a powder/zinc coating to resist rust. The top plate is a good size (about 5-1/8\ x 3\) for solid contact. They come with one crank handle and one 3/4\ socket adapter. By using two jacks, you get much better stability than a single universal jack. A simple, effective upgrade for any RVer who wants a more solid, secure feel when their slide-out is in use.