1.Item:Heavy-duty Ball Bearing Hinges 2.Material:Steel 3.Size:Variety Types ... Plated 5.HS:830021000 1. Product details(1) Item name: Heavy-duty Ball Bearing Hinges with Zinc Plated (2) Material: Steel(3 ... : carbon steel (hot rolled, cold rolled, strip steel), stainless steel, aluminum, brass, etc 2. Stamping, punching, bending, welding, threading, grinding, milling ...