Self-Lock folding hinges are easy to operate You just clicking the latches and fold down for more space Easy installation and strong carrying capacity Make of cold-rolled steels, the surfaces is electroplated, which is wear-resistant and anticorrosion, strong and Enduring This product can be folded 90 degrees and automatically in the open position through a spring activated within the hinge Suitable for folding leg brackets of folding bed, sofas, dining tables, platforms, tables, coffee tables and other furnitures to facilitate better placement and portability, Manufacturer: YanFengPro