4×8 embossed aluminium diamond plate sheet .haomei aluminium Diamond Plate’s 48” x 96” diamond plate sheet is made from 100% aluminum and in mill finish (silver.)or painted black. Embossed aluminum diamond tread plate sheet is our best selling diamond plate sheet.It’s usually 3003H22 Black diamond plate that has non-stamped preformed treads. Made of an aluminum / manganese alloy, Black Aluminum Diamond Plate sheet is used as scuff (kick) plates, running boards, mud flaps and more. It cuts cleanly, leaving a smooth edge.