Wing Spring Door Closer 5-1/4", Butterfly Spring, Fits on All Door Butt Hinge Pins, Keeps All Doors Closed, Rubber Sleeves on Wing (Pack of 2) Butterfly Spring Fits on All Door Butt Hinge Pins Keeps All Doors Closed Rubber Sleeves on Wing Zinc plated Just raise the pin in on one of your door hinges and slide it on. It's that easy.