Make any door self-closing! By simply replacing the pin in your standard door hinges with this small device, you can add a spring-loaded closer to any interior door. Hinge pin door closers are great for keeping children out of dangerous areas, keeping office doors closed, preventing mischievous pets from getting into the garbage, or any other situation where you don't want to get forget to close the door SMALL AND UNOBTRUSIVE -Unlike other door closers, it is small and unobtrusive. It's got a nice cylindrical cover which sits along the jamb behind the door so it's almost invisible.HOW IT WORKSAll you have to do is remove the pin from one of your door hinges and slide the SK50 into its place. You then set the closing tension using the included wrench, and test. If the door closes too hard or not enough, you can adjust the tension. Installation is quick and easy, but can be a little confusing, so we've provided a clear video in addition to the instructions included in the package.