Construction. Our heavy duty industrial carts utilize a fully welded construction using 12 gauge steel shelves and 3/16” thick corner posts with bolt-on casters. This superior design and construction ensures a heavy duty, rugged cart that will last for years. Many carts on the market today use lighter gauge steel and are of a bolt-together design, while these carts may suit light duty transportation, our welded steel carts will outlast and outperform others many times over throughout the