1.The good Corrosion and Oxidation Resistance 2.Easy Installation 3.High Accuracy 4.Warranty: 25 years Material aluminium alloy: 6061 /6063 T3-T8 Shapeaccording to drawing and sample (square, angle, flat, T-profile, rotundity, oval,slot)Deep machiningprecise cutting, drilling, tapping,CNC milling,CNC lathe and so on.Surface treatment polishing,brushing,anodized, electroplate,powder coating, ...