Aluminum diamond plate (also sometimes known as checker plate or floor plate) is available in the alloy 3003-H22. Aluminum diamond plate has a bright finish in the 3003-H22 alloy. Aluminum diamond plate is strong and lightweight. It is also corrosion-resistant and moisture-resistant, making it great for outdoor or indoor use. The diamond plate has a beautiful pattern that is slip-resistant and provides great traction. Aluminum diamond plate has the raised diamond pattern on one side and the reverse side is smooth.