... part, metal filter panelHole: round, square, diamondCharacter: winding-resisting, Ageing-resistingThe finished: electro-galvanized, Hot-dipped galvanized 2010 new perforated ... , copper plate, nickel plate. Processing and patterns:Perforated into diamond, square, round, triangle and decorative patterns ... the thickness of the sheet, length of perforated metal sheets, size and shape of the perforation ...