... perforated metal sheet hole shape is various ISO certificated material:carbon steel,stainless steel etc FOB port:Tianjin perforated metal ... be made in a range of round, square, slotted, or hexagon patternsThe round hole perforation is the most popular type ... , galvanized steel, aluminum, brass, and moreHole shape: round, square, long round, triangle, scale, diamond, oval, and moreAperture:In ...