Smooth and Silent Rotation: Utilizing precision-machined hinges and smooth bearing assemblies, the window hinges rotate freely without jamming or making noise. This makes opening and closing windows easier Strong Load-Bearing Capacity: The hinges feature a robust structural design that can stably support the weight of various window types. Even with prolonged use, they maintain structural integrity, preventing windows from sagging or warping Durable: Made of durable materials, the hinges resist moisture and daily wear and tear. They perform excellently in both indoor and outdoor environments, maintaining their appearance even after long-term use Safe and Stable Installation: The hinges are designed with a sturdy fixing structure, ensuring a secure installation on the window frame without loosening. Precise hole positioning makes alignment easy during installation Wide Compatibility: Suitable for a variety of window materials, including wood, aluminum alloy, and PVC windows. It fits most standard sizes and types of windows, Manufacturer: CIGPKLO