Niuniu Feature Affordable, super practical, prepare the lid automatically pops back cover. Easy to use, eliminating the need to lift the tail cover unarmed trouble. Installation is simple, a hook hung soon be able to get. Let you spend a little, enjoy the convenience of high-end configuration. 100% Brand new and high quality. If your car trunk have function of remote control, but will not be rising box, you can add this spring, after then, open will automatically rises box, to avoid the unarmed to mention the lid of the trouble. With automatic design, you can adjust the height by yourself. Fixed on the car trunk, can prevent the trunk damage head. Flexible and adjustable. Specifications: Material: Metal Size: Shortest 17.5cm,Largest length about 24cm(Flexible and adjustable) Color: As shown Package Included: 2*Spring automatic lifting device 2*buckle Notice: 1.Please allow 1-3cm error due to manual measurement.Pls make sure you do not mind before you bid. 2.The color may have different as the difference display,pls understand.