Features: -Equipped with a locking mechanism, the hinge automatically locks when the stopper is in the open position, and you can unlock it by pressing the lever. -Easy to install, no need to drill holes, no damage causing damage, just clip on the table edge and tighten. -The extension stand creates additional space on your desk, provides support for your arms, and reduces stress on your wrists and shoulders. -Made of thickened steel, it has high hardness, toughness, stability and strong load-bearing capacity. -Suitable for studios, offices, bedrooms, study rooms, workshops and other places. Specification: Material: steel Colour: black Size: as shown Suitable table thickness: 1-5cm .