Yes this system does keep the door on your cooler or freezer shut when it is closed. You mount the Hook above the door and the door closer latch on the door. You must order both pieces to complete the latch. Here is further information. Patented solid steel enclosed housing and bend-resistant hook assure long wear in heavy use. Extra-wide hook ensures roller pick-up and overcomes alignment problems. Life-cycle tested to operate reliably even after a half-million closures. Easily replaces any conventional door closer.