Features: Make of cold-rolled steel, the surfaces is electroplated, which is wear-resistant and anticorrosion, strong and Enduring. This product can be folded 90 degrees and automatically lock in the open position through a spring activated lock within the hinge. Self-locking folding hinges are easy to operate. You just clicking the latches and fold down for more space. Suitable for folding leg brackets of folding bed, sofas, dining tables, platforms, tables, coffee tables and other furniture to facilitate better placement and portability. Easy installation and strong carrying capacity. Specifications: Materials: Cold rolled steels Styles: Colored Zincs/Silver/Black/Press Fold Hinge Size: about 6.6x6.35cm/2.60x2.5inch Package Includes: 4pcs Hinge note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.