... Design,Quick Sample 4)Architectural Sunshade Architectural Perforated Aluminum Railings-Round Perforations - 45 degree PatternSquare Perforations Straight Row Specification: 1) Material ... /stretching), Hydroforming4) Mechanical Surface Treatment: Grinding, Anodizing, Painting, Power coating, Screen printing, Tampon printing, Sandblasting, Polishing, Tumbling (barrel polishing),Electroplating etc ...