Features: and high quality Adjustable 3 to 5 gears with a maximum angle of 180 degrees, offering 7 available combinations Suitable for sofas, beach chairs, fishing chairs, folding beds, and other folding furniture Spring-driven mechanism allows smooth adjustment of armrests, backrests, pillows, and seats Made of high-quality iron for durability Smooth edge design with no sharp edges or corners, providing enhanced safety and aesthetic appeal Specifications: Material: Iron Surface Treatment: Zinc-white plating Color: Silver (as shown in picture) 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: - 3 Gears: 45 degrees - 3 Gears: 180 degrees (diagonal) - 4 Gears: 180 degrees - 5 Gears: 90 degrees - 5 Gears: 180 degrees Package Includes: 1 x Folding Sofa Hinge Note: - Please allow 1-2cm measurement deviation due to manual measurement. Ensure you are comfortable with this before ordering. - Due to differences in monitor displays, the actual color of the item may vary slightly from the image shown.