... 830021000 1. Product details(1) Item name: Heavy-duty Ball Bearing Hinges with Zinc Plated (2) Material: Steel(3) ... plate enables welding to flat steel surfaces.Easy action ball bearing pivoting enables effortless movement of the gate.Double ... , strip steel), stainless steel, aluminum, brass, etc 2. Stamping, punching, bending, welding, threading, grinding, milling, machining, lathe, assembling etc ...