what: perforated metal mesh which:stainless steel, carbon steel,zinc,Galvanized,Aluminum,Brass ... to 25mm. Length is the overall measurement of the long side of the sheet. Width is the overall measurement ... you tell us the exact specification.The hole shapeRound, square, long round, triangle, scale, diamond, oval, hexangular, slot etc. ... If not, we will according to standard tolerance. perforated mesh