STOP !T is a very simple and plain doorstop for doors with an automatic door closer. It actually uses the automatic door closer to keep the door open without scratching the floor, entangling with the carper, accidentially getting kicked away… Just open the door, slide it in the automatic door closers slot and softly release the door. It will rest against stop!T and remain open… When unused just place it on top of the automatic door opener, so it is always at hand when needed. Used mine for years now and would not want to miss it!