ETGtek 1set Lift up Modern Coffee Table Desk Mechanism Hardware Fitting Furniture Hinge Spring Stand Rack Bracket Turn a normal coffee table into a tricked-out coffee table.Just attaching the springs on the hinges,very simple to use. Premium quality material.Made of metal,anti-rust and corrosion-resistant,durable and sturdy to use,not easy to bend and break. Using them can help you save much space,smoothly,beautiful appearance that make you home more clean and tidy,perfect for your project. 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. Easy to setup,easy to open and close.These are definitely worth the money you won't miss it.Internal springs can provide some push to make it easier to lift the top.