... center dis:1.4-70 perforated metal :Materials: stainless steel mesh, aluminum, copper, steel board, PVC filmType: long, round ... hole, plum, nails, and other special hole hole and push.Classification: steel nets, micro hole boards, sound-absorbing board, ... punching, porous plate, simple perforation plate, horn, speakers, mesh, filtering, and its shape stamping composition design, and can accomplish ...