... Metal mesh ,perforated metal sheet , perforated metal plate...shape of the hole :round hole, square hole, diamond hole, triangle hole, hexagonal ... requiredMaterial: low carbon steel, aluminum, hot and cold copper plate, the plastic plate, copper plate, nickel plate, Size1. coil 1 × 20M ... of granary , protection for mechine,sound insulation, heat dissipation. perforated metals (factory)