... .1-1.5M center dis:1.4-70 perforated metal :Materials: stainless steel mesh, aluminum, copper, steel board, PVC filmType: long, round ... -absorbing board, punching, porous plate, simple perforation plate, horn, speakers, mesh, filtering, and its shape stamping composition design, and can accomplish ... .65%round hole 15281.56026.03%round hole 153016022.67% perforated medal mesh