Cambro, EXA213064V4480, Camshelving® Elements XTRA Stationary Add-On Unit, 21"W x 30"L x 64"H, 4-tier, withstands temperature from -36°F (-38°C) to 190°F (88°C), includes: (4) vented reinforced polypropylene shelf plates with Camguard® antimicrobial protection, (2) composite posts with leveling feet installed, pre-assembled post connectors & wedges, (8) Universal Traverses & (4) bags of 4 dovetails (8 left, 8 right), 800 lbs. capacity per shelf /2,400 lbs. max capacity, speckled gray, NSF (NOTE: This is a new product line. It is NOT compatible with original Elements Series products.)