2pcs Folding Sofa bed hinge mechanism 5-Position adjusting joint hinge for Couch Armrest, headrest, backrest Furniture hardware Features: 100% Brand new & High quality Mainly used for angle adjustment of all kinds of furniture, according to different gears, used for different positions of furniture, generally used for various joint position adjustments such as armrests, headrests, backrests, etc. Starting angle 90 degrees: 3 gears, 5 gears, 7 gears, 8 gears, 10 gears; Starting angle 99 degrees: 7 gears; Starting angle of 108 degrees: 6 gears, 8 gears; Starting angle of 117 degrees: 5 gears, 7 gears, 10 gears; Starting angle of 135 degrees: 10 gears; Starting angle 180 degrees: 3 gears, 5 gears, 8 gears; The product is not divided into left or right, bearing 90kg/2pcs packing include: 2pcs X Sofa armrest hinge