Polypropylene The exclusive LocBin hanging bins have an interlocking feature that guarantees bins will stay attached to each other Wall mount rail system replaces expensive steel louvered panel systems and has two 8-3/4-Inch LocBin wall mount system includes 24 red commercial grade plastic bins and 2 wall mount rails bins can be added to expand the system Each row of bins can be removed from the wall mount rail and taken wherever the work is being performed LocBin complete wall mount bin system includes the wall hangers