... area: 0.3%-63%Process: punchUse: Filter part, metal filter panelHole: round, square, diamondCharacter: winding-resisting, Ageing ... , railway, civil building, water conservancys building; the protecting of all kinds of machines, electrical equipment, window ... stainless steel, aluminum steel, plywood, hipboard, density board, plastic film, etc. Hole shapes:Round, rectangular, square, triangle, hexagonal, ...