Package included: 4 pcs 120N soft close gas struts with screws for slowly opening/closing heavy duty flap door and box lid. Opening angles: 75, 90 or 110 degrees. The piston arm length 27.7cm. Thickness: 1.5 cm. [ Force ]: 120N (each strut), load-bearing: 12kg (each strut), if you use two struts at the same time, the load-bearing will be 24kg. ★ Note: Make sure your door weight is similar to this strut force. If the door is too light, the door will not be closed. [ Function ]: This door damper can be a lift assist, which keep a heavy door/lid open slowly without problems. Whilst, it can work as a shock absorber, allowing the lid to be easily and slowly closed to prevent the lid from slamming shut. In addtion, they keep the operation quiet. Sturdy strut hinge for large wood toybox with very heavy lid. Effective in lifting heavy duty furniture flap door, flip up door and panel which is long and heavy. Perfect hydraulic piston strut to replace faulty piston arm on kitchen unit, top hinged kitchen cupboard door, cabinet door, storage chest lid, and other wall unit with large flap door. The instructions are printe on the plastic packet, which indicating where to place depending what angle you want your lid holding open to. ★ NOTE: Don't put the attachments on the strut until you're ready to fit it, as they are near impossible to get off, which can make the process of the installation difficult. So you should firstly install the attachment on the door and after that fit the strut on.