... Mold Design,Quick Sample 4) OEM OK Polished Aluminium Window/Door Knobs for Door/ WindowSpecification:Material: Alluminum Alloy: 1x,2x, 3x, 4x, ... Insulation, Platic forming, HydroformingApplication: Aluminum polished/ anodized door knobs for all kinds of door or window in Industry, Architecture, Decoration..and so on ... with a thorough understanding of customer requirement. till Aluminium Window Knobs