Made of Hardened stainless steel/aluminum, this labor-saving arm jack can withstand up to 260 lb / 120 kg weight. The height can be raised by 5-100mm. Suitable for floor, brick wall, window, deck, porch installation. Which can save effort and time of your family. How to use: 1.Hold the handle tightly to raise the height. 2.Press the steel platen lightly to reduce the height. Specifications: Capacity: up to 120 kg/265lbs. Operating range (IN): 0.2-3.9. Standard base (IN): 3.9 x 2.4 x 0.2. Support panel (IN): 2.7 x 2.3.x 0.1. Weight: 2.29lb.