... tolerance 4.QC inspect after products finished 5.spring clip Product name Industrial canopy stainless steel door hingesControllable toleranceEquipped with the hight-efficiency ... , Auto CAD, Solid Works , UG, CAD/CAM/CAEMaterial Range:Metal: Stainless Steel, Brass, Aluminum, Steel, Carbon Steel.Plastic : PU, PVC, POM ... . Description High-quality, well-fame credit ,and good materials torsion spring clip