Adjustable furniture hinge for folding beds and sofa mechanisms, 3-position angle adjustment, automatic locking bracket, 2 pieces included Features: Brand new and high quality Designed for connecting sofa backrests, seats, armrests, pillows, and bed frames Enables adjustable height and angle positioning of sofa backrests Compatible with connections between armrest and seat, backrest and seat, pillow and backrest, armrest and backrest, and bed frame components Gear-driven mechanism allows smooth angle adjustment between multiple positions Automatic locking function for secure positioning Easy to install with gear-operated open and close design Supports multi-angle and multi-range adjustments Material thickness: 2mm Package includes: 2 x Sofa hinges