... Product details(1) Item name: Heavy-duty Ball Bearing Hinges with Zinc Plated (2) Material: Steel(3) Size: ... rolled, cold rolled, strip steel), stainless steel, aluminum, brass, etc 2. Stamping, punching, bending, welding, threading, grinding ... 3. Finishing: Anodizing, Powder-Coating, Zinc-Plated, Chrome coated ,Nickel Plated ,Copper Plated, Rust-inhibiting oils, Electrophoresis, Paints and primers, ...