THE POLY-Z-BRITE FINISH INCLUDES NEXGARD , AN ANTI MICROBIAL COMPONENT THAT FIGHTS THE GROWTH OF BACTERIA AND MOLDS AND A 15 - YEAR LIMITED AGAINST CORROSION. SHELVES ADJUST WITHOUT UNIT DISASSEMBLY ON 4 PLASTIC SLEEVES (INCLUDED).Poly-Z-Brite® DS1848Z Heavy Duty Wire Shelf 48"W x 18"D NSF APPROVED..