1. Ball bearing hinges are sturdy and built to withstand daily wear and tear, with good strength and durability. 2. Ball bearing hinges ensure smooth door operation and withstand frequent use, even with heavy doors. 3. Ideal for indoor and outdoor, residential and commercial use, they offer excellent stability and versatility. 1. High strength resistance, strong wear resistance, easy and quick installation 2. Stable structure, polished and polished without burrs, easy and gentle installation 3. Silent roller opens the silent experience and is widely used, Manufacturer: RIHATAP