Give protection to your slide-out extension tubes from bending, causing tough slide-out operation. Stabilizer jacks fortify 10,000 lbs. every and adjust from 20” – 34” H. The five” dia. circular bases are stable on any surface and withstand sink-in. U-formed tops are compatible so much slide-out frames. All portions are powder coated or zinc plated for corrosion resistance. Set of 2.