NEXEL DF1830Z POLY-Z-BRITE THREE-SIDED WIRE FRAME 30""W X 18""D CONSTRUCTED OF 1"" SQUARE STEEL TUBING THIS THREE-SIDED FRAME PROVIDES EXTRA STRENGTH AND STABILITY FOR SHELVING UNITS. POLY-Z-BRITE FEATURES A CLEAR POWDER-EPOXY OVER ZINC-CHROMATE ELECTRO-PLATING THAT HANDLES TEMPERATURE AND MOISTURE EXTREMES WELL. NEX GARD AN ANTI-MICROBIAL AGENT PROTECTS THE EPOXY COATING FROM MOLD AND MILDEW THAT CAUSES ODORS AND PRODUCT DEGRADATION. NSF APPROVED FOR WET OR DRY USE. LIMITED FIFTEEN WARRANTY AGAINST RUST AND CORROSION.