Akro-Mils industry leading 4 in 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 in, 18 in and 24 in deep bins work with standard wire or steel shelving. one-piece construction is waterproof and unaffected by grease or oil. Make the most of your shelf bins with optional bin Cups which subdivide bins and lift out easily for transport.