General description Made of durable stainless steel, these 4-inch ball bearing door hinges feature precision workmanship and high strength, making them resistant to rust. The anti-rust treated surface ensures excellent corrosion resistance, firmness, and durability. Designed for silent operation, the lubricated ball bearing mechanism allows for noise-free opening and closing of doors. Technical specifications Size: 4 inches (100mm) Material: Stainless steel Mounting holes: 8 Compatibility and accessories Suitable for standard residential interior doors Can also be used for cabinets, doors, windows, wardrobes, toolboxes, etc. Installation Can be installed firmly on the door using the 8 mounting holes