Durable polypropylene Bins are waterproof (unaffected by grease and oil) Available in 12", 18" or 24" depth. Add bin dividers to separate small parts. These durable polypropylene bins are designed for either 12", 18" or 24" deep shelving. Polypropylene bins outlast corrugated and pay for themselves in reduced replacement cost. Bins are waterproof and unaffected by grease and oil. Front of bin has large label area. Bin cups fit into all bins. Add bin dividers to bins to separate small parts and supplies.