The Metro MXTTM21S Track Shelving Kit is designed for use in wet or corrosive environments, ensuring durability and reliability. This kit includes four corrosion-proof posts measuring 74 inches in height, four bumpers for added protection, four roller assemblies for smooth mobility, two caster channels, and four plate casters for easy maneuverability. It is compatible with MetroMax® 4™ and MetroMax® Q™ shelves (sold separately) and meets NSF standards for safety and sanitation. Ideal for maximizing storage efficiency in challenging conditions.