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. Smooth surface, no burrs on the edges, no piercing, strong 2. Strong load-bearing, firm and stable, silent and smooth and flexible shaft 3. Tight connection without shaking, silent and flexible, smooth and light opening, Manufacturer: RIHATAP