Spring Hinge Invisible Door Self-closing Buffer Damping Hinge Automatic Door Closer Hidden Door 4 Inch Steel Wire Drawing 1. Solid steel cutting process, real material, durable, rust-proof, healthy and environmentally friendly. 2. The hinge surface adopts multi-layer electroplating process, which is corrosion-resistant, wear-resistant and durable. 3. Multi-function is the first three, is hinge, door stop, door closer. 4. When the door is opened to 90 degrees, the positioning beads are stuck, and the positioning can be positioned. 5. Invisible door hinge, 90 degree positioning design to automatically close the door. Note: Due to different monitors and lighting effects, the actual color may be slightly different from the image, please allow 1-3mm deviation due to manual measurement Included: 1 x spring hinge