The Cambro EXHDPK1878480 is a Camshelving® XTRA High Density Post Kit designed for mobile shelving units. This kit includes two high-density casters for easy mobility, donut bumpers for added protection, two sturdy posts, and a complete set of post connectors for secure assembly at both the top and bottom. With dimensions of 18"W x 78"H, this speckled gray post kit is NSF certified, ensuring it meets strict public health standards. Please note that this product is part of a new line and is not compatible with original Elements Series products.