The Cambro CSMHDTKE4000 is a High Density Track Extension Kit designed for Camshelving® Premium Series High Density mobile units. This kit includes two aluminum raised tracks, each measuring 4-1/2 feet, along with a joiner kit that features two joiners and the necessary hardware for installation. Enhance your storage capabilities with this durable and efficient extension kit, ensuring seamless integration with your existing shelving system. Ideal for maximizing space and improving accessibility in various environments.