1. Durable - These residential door hinges are made of iron with a matte surface treatment. They are durable, rust-resistant, and have stable performance and good durability. 2. Smooth closing - These folding door hinges adopt a sliding bearing structure, ensuring relatively smooth opening and closing. 3. Application scenarios - These interior door hinges can be installed in indoor and outdoor places such as door frames, wooden boxes, shed windows, shutters, shed vents, apartments, playhouses, and animal shelters. 4. Exquisite craftsmanship - The hinges feature thickened zinc alloy leaves, which are integrally stamped by a CNC lathe. They have relatively high hardness, are not easily broken, and have a relatively long service life. 5. Silent design - Damping oil is added to the hinge pins. Although the pins are non-removable, there is little to no creaking sound when opening and closing the door, achieving a relatively silent effect.