1.Durable & High Quality - These residential door hinges are made out of premium iron material with mattefinish. They are constructed to be long-lasting and rust-proof, accompanied with stable and heavy duty performace 2.Smooth Closing - Operated by plain bearing construction, these bifold door hinges features smooth. 3.Applications - These interior door hinges can be mounted on door frames, wooden box, shed windows, shutters, vents for sheds, apartment, playhouses, animal shelters and other indoor and outdoor use. 4.Fine workmanshiThickened zinc-based alloy blade, the blade is stamped in one piece by CNC lathe, super hardness, not easy to break, longer service life. 5.Noise-Free - Damping oil is added to the pin, so our pin is non-removable but it is NOISE-Free, which means when you open and close this door, it doesn't creak.