Self-Locking Design The folding hinge has a spring-activated "forced lock" that can be locked in the open position to ensure stability. When not in use, it can be folded up for more space. High-Quality Material Table Leg Folding Hinges are made of hot-rolled steel, which is durable, wear-resistant and has a smooth surface without burrs. They are also the right size and are invisible for the most part. Easy to Install Folding table extension brackets are very easy to use, simply fold in the desired direction and screw the hinges to the sides of the furniture. The support legs can be folded 90 degrees, installation only takes a few minutes, which is a great time saver. Multifunctional Folding leg fittings are suitable for folding beds, kitchens, shops, warehouses, sofas, dining tables, DIY platforms, tables, etc. They can also be used as a simple invisible mount. Perfect for applications with limited space and flexibility. Packaging and Size You will receive 4 folding hinges, the dimensions are: 70X45MM, sufficient quantity for your needs. The elastic hinge table leg frame is adjustable for easy adjustment of sofas and other furniture.