Ultra-Fab Products (19-960002 21" to 37" Slide Out Support Helps stabilize all RV slide-outs. Reduces rocking motion Fits extension tubes up to 4-1/2" wide. Sold in pairs. Exclusive quick release allows you to adjust the length of the support in seconds Stabilizes slideouts for those extended stays in campgrounds Made of heavy duty steel and finished in a black, wrinkle coat finish Lifetime manufacture warranty Sold in pairs