NEXEL DF2430Z POLY-Z-BRITE THREE-SIDED WIRE FRAME 30"W X 24"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.