Perforated Metal Sheet Hole:round hole,square hole,etc. Quality Certification:ISO9001:2000 Metal width:0.5m-3m ... ,316L,310s, Aluminum,copper,carbon steel,Galvanized.Opening Pattern:Rectangle, square, round, triangular, blossom, hexagonal and many other special patterns ... Perforated MeshStainless steel Perforated MeshEtched mesh(by Chemical Erode)Punch Hole Mesh Abnormity Perforated Metal Sheet