Material: Copper. Invisible, cylindrical, concealed furniture hinges, 180° opening angle, convenient to use. Suitable for hotels, wooden doors, cabinet doors, counters or tables in commercial vehicles, and other DIY projects. With these small hinges, you can make your own pens, pencils, or other small boxes or crates. If the hole is too large to prevent the hinges from falling out easily, you can fix them with a wood screw. With large load capacity. The maximum load capacity of 2 pieces is 8 kg.