... Technical:perforated Hole punch sheet metal :1. Hole Punching Metal Mesh Material: Low carbon steel board, stainless steel ... board, copper board and nickel board.2. Hole Punching Metal Mesh Characteristics: The surface is flat, smooth, beautiful ... and grain storage ventilation, mechanical protection5. Hole patterns of Hole Punching Metal Mesh: Round, Rectangular hole, square, Triangle, Diamond, ...