1.Item:Heavy-duty Ball Bearing Hinges 2.Material:Steel 3.Size:Variety ... Plated 5.HS:830021000 1. Product details(1) Item name: Heavy-duty Ball Bearing Hinges with Zinc Plated (2) Material: Steel ... , brass, etc 2. Stamping, punching, bending, welding, threading, grinding, milling, machining, lathe, assembling etc. 3. Finishing: Anodizing, Powder-Coating, Zinc-Plated ...