FCS001 is a heavy-duty steel bed frame support system. The horizontal center bar adds additional support to your mattress to give you a better night’s sleep. It also prevents your mattress from sagging in the middle to increase the life of your new or current mattress at a very reasonable price. This support system works with your twin, full or queen size steel bed frame or wooden rails with a lip, as it is adjustable. Includes 1 single horizontal center support, nuts and bolts for L shaped steel side rails and screws for the wooden frames with lip, plus C-clamps for width adjustments up to 61 inches and adjustable threaded steel guides from 6 – 9 inches tall. Installation is very simple; you remove your mattress and box springs from your bed frame and adjust the bar to the width of your existing frame. It attaches with nuts and bolts or wood screws onto your bed rails. You can adjust the height of the two legs near the left and right sides of the rail to the exact height of your existing bed frame. Features: Twin, Full, Queen Beds Only, Made from high carbon remanufactured rail steel, Fits most angle steel and wood side rails with lips, Heavy Duty threaded steel glide for height adjustments with feet, C-Clamps for width adjustment, Adjustable Height: 6 inches - 9 inches, Adjustable Width: Up to 61 inches