... .3%-63%Process: punchUse: Filter part, metal filter panelHole: round, square, diamondCharacter: winding-resisting, Ageing-resistingThe finished: electro-galvanized, Hot-dipped galvanized Material: low ... , hipboard, density board, plastic film, etc. Hole shapes:Round, rectangular, square, triangle, hexagonal, diamond, lightly pull scale, cross, slotted and special ...