... hole metal ISO9000:2008 Material:aluminum ,low carbon steel ,G I ,SS Technical:perforated,punching make squrae hole metalHole punching metal :1. Hole Punching Metal ... board, copper board and nickel board.2. Hole Punching Metal Mesh Characteristics: The surface is ... storage ventilation, mechanical protection5. Hole patterns of Hole Punching Metal Mesh: Round, Rectangular hole, square, Triangle, Diamond ...