Cambro, EXMU214870V4480, Camshelving® Elements XTRA Mobile Unit, 21"W x 48"L x 70-1/4"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, (4) composite posts, pre-assembled post connectors & wedges, (8) Universal Traverses & (4) bags of 4 dovetails (8 left, 8 right), (4) premium swivel casters with total locking brake, 900 lbs. max capacity, speckled gray, NSF (NOTE: This is a new product line. It is NOT compatible with original Elements Series products.)