Shelving separates, organizes and stores products and components. Shelving units come in three main types. Rotary shelving units are small, mobile units that separate and hold parts and tools. Modular shelving units are large units that hold system bins, which organize and store many different products, parts and pieces of equipment. Fixed shelving units have fewer shelves, but they can hold large totes and bins. Shelving accessories such as rubber matting, steel footplates and adjusting clips can be used to improve a shelving unit's function.