The Mainstays Leg Extension Kit makes it simple to add your choice of either 3 or 4.5 inches of clearance space from the ground to bottom shelf of your existing Mainstays model 9409WWWM20 spacesaver. Each set includes a pair of leg extensions good for one unit. You can add 3 inches of clearance from the floor to the bottom of your spacesaver with simple tool-free installation. Just slide the extension onto each leg at the bottom of your spacesaver. Or add a full 4.5 inches of clearance with easy screw-in installation.