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% 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. Specification: Material: Metal Size: Shortest 14cmLargest length about 24cm(Flexible and adjustable) Color: Blue & Silver Package Included: 1*Spring automatic lifting device NO Retail Box. Packed Safely in Bubble Bag.