... 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 ... brass, etc 2. Stamping, punching, bending, welding, threading, grinding, milling, machining, lathe, assembling etc. 3. Finishing: Anodizing, Powder-Coating, Zinc ...