POLY-Z-BRITE® 5 TIER WIRE SHELVING ADD-ON UNIT 72""W X 21""D X 63""H. ADD-ON SHELVING UNITS ALLOW UNIT EXPANSION TO MAKE THE MOST OF STORAGE SPACE. INCLUDES 2 POSTS WITH LEVELING FEET 5 SHELVES SNAP-ON SLEEVES AND S-HOOKS TO JOIN UNITS. POLY-Z-BRITE® FEATURES A TRUE POWDER-EPOXY OVER ZINC-CHROMATE ELECTRO-PLATING THAT ENSURES A STRONG DURABLE FINISH AND HANDLES TEMPERATURE AND MOISTURE EXTREMES WELL. OPEN DESIGN MAXIMIZES AIR AND LIGHT CIRCULATION AND MINIMIZES DUST ACCUMULATION. SHELVES EASILY ADJUST WITHOUT TOOLS AND ALIGN ACCURATELY AT 1"" INCREMENTS. SHELF CLIPS SNAP ON POST ALLOWING SHELF COLLAR TO SLIDE OVER FOR A SECURE FIT.