@welddotcom: The shape of metal you will use often when building projects is square or rectangular tubing. When looking to buy tubing, you will need to know the lengths of the sides you want and the wall thickness. These usually come in lengths of 20 to 24 feet, depending on your supplier. If you are new to buying metal and need help, watch the full video on YouTube https://foxly.link/UGNtaK #metal #steel #squaretubing #tubing #rectangulartubing #metalsupply #steelyard #welddotcom