D&D SHUT IT HardCORE Carriage Plates are made to replace traditional wheel boxes and enable you to install your HardCore Gate Wheel inside the bottom of the gate itself. Comprised of either rust-resistant, high-quality aluminum or durable, corrosion-resistant steel. The HardCORE Carriage Caps, ideal for chainlink gates, allow you to use carriage plates on a round bottom rail. The entire product line is continually field tested in the most extreme of conditions and every unit sold is put through a rigorous quality control process, these HardCORE products are made to last.