1) Aluminum Enable Upscale Appearance, best cooling 2) Reliable Quality Best Price 3) Free Mold Design,Quick Sample 4) OEM OK Polished Aluminium Window/Door Knobs for Door/ WindowSpecification:Material: Alluminum Alloy: 1x,2x, 3x, 4x, 5x, 6x, 7x seriesTemper: O, T1, T4, T5, T6, H12Shape: Panel/ ShellSize: Flexible SizeSurface Treatment: Anodized, Power Coating, Sandblasting, Polishing, Grinding, ...