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. Double check your cabinet's opening (inside dimensions) to allow the best fit. Measure side to side (width), front to back (depth or length), and top to bottom (height). Double check to make sure your product is within measurements and don't forget to take into account any obstructions (plumbing, hinges, etc.). Beautify your kitchen and keep your trash cans hidden under the counter with the Rev-a-Shelf 4WCBM Base Cabinet Pullout Waste Containers.