Ⅰ. This pair of items is made of steel material, anti-rust and corrosion-resistant, durable and sturdy to use, not easy to bend. Their thicknesses are 2.0mm and 4.0mm, and they can load a capacity of about 50kg. They can be disassembled and are easy to operate; according to needs, they can be used to sit or rely on. It is a nice product at a good price, worth buying. Ⅱ. Made of steel material, anti-rust and corrosion-resistant, durable and sturdy to use, not easy to bend and break. Ⅲ. With a load capacity of about 50kg/100lb, they are used as a lift-up coffee table mechanism hardware. Ⅳ. With this kind of lift, you can turn a normal coffee table into a functional coffee table; they can also be used to change the function of other tables. Ⅴ. Using them can help save space, making the home cleaner and tidier, suitable for projects. Ⅵ. Easy to assemble and simple to use. Ⅶ. Condition: New Color: Black Material: Steel Load Capacity: Approx. 50kg / 100lb Angle Range: Approx. 125 degree Thickness: Approx. 2.5mm and 4.0mm Folded Size (L x W): Approx. 340 x 102mm / 12.6 x 4inch Bottom Size (L X H): Approx. 172 x 45mm / 6.8 x 1.8inch Raise-up Height: Approx. 140mm / 9.5inch Top Forward Length: Approx. 228mm / 9.0inch Package Weight: 1.44kg Ⅷ. Package Included: 2 x Hydraulic Hinges Ⅸ. Made of steel material, anti-rust and corrosion-resistant, durable and sturdy to use, not easy to bend and break Ⅹ. Can load about 50kg/100lb, so they are used as a lift up coffee table mechanism hardware fitting furniture hinges with springs Ⅺ. With this kind of lift you can turn your normal coffee table into a functional coffee table, they also can be used to change the function of other table Ⅻ. Using them can help you save much space that make you home more clean and tidy, suitable for your project ⅩⅢ. Easy to assemble, just attaching the springs on the hinges, very simple to use