Features: high quality 3 to 5 gears are adjustable, the maximum angle is 180 degrees, and 7 combinations are available. Suitable for sofas, beach chairs, fishing chairs, folding beds and other folding furniture. Driven by springs, the inclination of armrests, backrests, pillows and seats are adjusted in a fitting manner. Made of high-quality iron material, durable. Smooth edge design, no for sharp edges and corners, more secure and beautiful. Specifications: Material: Iron Surface Treatment: Zinc-White Plating Color: Silver(As Picture Shows) Hole Size: 6.5mm/0.26inch Length: 15cm/5.90inch Pipe Diameter: 16mm/0.63inch Thickness: 2mm/0.08inch Gear Part Thickness: 2.3mm/0.09inch Number of Gears: Positive 3 Gears 45 Degrees / Third Gears 180 Degrees / Diagonal Third Gears 180 Degrees / Positive Fourth Gears / Fourth Gears 180 Degrees / Fifth Gears 90 Degrees / Fifth Gears 180 Degrees Package Includes: 1x Folding Sofa Hinge note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.