Check the listing for details. 4Pcs Adjustable Sofa Hinge, 180 Degree 3 Gear Support Joint for Sofa. Condition: New. Listed at 52.46 USD. Description:Material: The adjustable sofa hinge is crafted from iron material, this robust material ensures that the hinge can withstand regular use without breaking or deforming easily. The iron construction provides a sturdy base, making it suitable for furniture that requires reliable support and longevity.Function: This sofa support joint offers versatile adjustment capabilities, it is driven by springs, enabling the smooth adjustment of armrests, backrests, pillows, and seats to fit various positions comfortably. The hinge's reasonable structure and easier adjustments, making it perfect for connecting different parts of furniture, such as the backrest and seat board, or bed frame and bed.Easy to Use: Installing the adjustable sofa hinge is a breeze, requiring only a screwdriver for assembly.