Make any door self-closing by simply replacing the pin in your standard door hinges with this small device from Ideal Security. Unlike other door closers, the SK50 is small and unobtrusive. It's got a nice cylindrical cover which can be color-matched to your hinges, and sits along the jamb behind the door so it's almost invisible. All 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. 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, please consult instructional video in addition to the instructions included in the package. For the SKS0 to work properly, you need to have at least 1/2-inch of distance from center of hinge to door trim, otherwise the SK50 will not fit. The device works best on doors that weight 30 lb. or less, that latch closed, that are located in a space with good air flow.