Akro-mils industry leading 4" tall shelf bins are constructed of durable industrial-grade plastic and provide a neat and attractive storage solution. The superior construction of these affordable plastic storage bins allows them to be fully loaded without bulging or cracking and multiple divider slots allow for a greater number of storage options. Akro-mils shelf bins are a superior alternative to weak and flimsy cardboard bins. 12", 18" and 24" deep bins work with standard wire or steel shelving. One-piece construction is waterproof and unaffected by grease or oil.