The 4WCBM Series Waste Containers are the only bottom mount units available with the Rev-A-Shelf patented Rev-A-Motion soft-open soft-close slide system. The innovative gas spring assisted soft-open allows the unit to open smoothly and the soft-close shuts softly, even under the heaviest of loads. All units feature metallic silver waste containers and built-in door-mount brackets and many have a removable wood bin in rear for bag storage. The 4WCBM is easy to install with only (5) screws and features a beautiful dovetail constructed frame, concealed 150 lb. slides for a clean look.