... center dis:1.4-70 perforated metal :Materials: stainless steel mesh, aluminum, copper, steel board, PVC filmType: long, round ... board, punching, porous plate, simple perforation plate, horn, speakers, mesh, filtering, and its shape stamping composition design, and can accomplish ... .36022.67%round hole 12521604.83%round hole 1233.56*171specialspecialround hole 131716053.03%round hole 132266031.67%round ...