Product Introduction: When stretched, the storm door spring stores elastic energy. Upon release, its restoring force pulls the door shut automatically, replacing traditional closers with cost savings and easy installation Suitable Door Type: Designed specifically for lightweight screen and storm doors, the screen door spring matches their low-weight build with just-right tension to enable smooth High-Quality Material: Crafted from galvanized steel for both the v6 screen door spring and self - tapping hooks, it boasts a corrosion resistant zinc coating to endure outdoor wet. The steel’s tempered elasticity provides optimal tension, enabling lightweight screen or storm doors to close smoothly without slamming Easy to Install: Just align the included self-tapping hooks with the corresponding positions on the side of the screen door/storm door and the door frame, screw them in by hand to secure, then hook both ends of the door springs close onto the hooks What You Get: You will get 1 x V6 door spring with 2 small hooks, helping you make lightweight screen doors/draft doors automatically close Great for househould use, install the extension on to your storm and screen doors .Then the spring will automatically need to retract back to its normal position, this causes the doorto swing closed after use.