High Quality Stainless Steel: Car trunk lid springs are made of high-quality high-carbon alloy steel metal, which is strong and durable, and corrosion-resistant. The trunk spring tool has a long service life and is not easy to deform. Compared with ordinary trunk springs, it is more reliable and is not easy to be pulled off after improvement. Full Screw&Anti-Breaking: Unique car trunk cover spring design, full screw adjustment, anti-break conical limit, reinforced spring ring, the force can be adjusted. Adjust the size of the force through the screw length to make the opening just right. You can adjust the length by yourself. Trunk opening size depends on spring length. Easy to Install and Operate: Car trunk cover springs are easy to install. You just need to adjust the screws on the springs according to the size of the trunk. To facilitate the installation of the fixed spring and adjust the strength to achieve the best switching state. Car boot cover springs can be easily installed by both novice and veteran. Convenient and Practical: The trunk opens automatically with the flick of a button, and it's easy to open when you're holding a shopping bag or school bag. If your car trunk has remote control function but does not fully open, then you can install this spring and your car trunk will automatically fully open. Notes: The car trunk lid spring is only suitable for sedan with no hydraulic lever in the trunk lid. It is not suitable for vehicles with hydraulic lever in the trunk lid.