The GlideLok Metal Door Top Safety Lock is a brand new product. It rests on top of the door so tots can’t reach it. A peg screws in on the upper door frame and the lock slides on/off the peg to lock and release from both sides. Perfect for exterior or thicker doors but can also be used for interior doors. Weather resistant and more durable than plastic models. Can be used for a variety of door thicknesses from 1 3/8″ to 1 13/16″, simply unscrew spacer for thicker doors. It has holes for the possible attachment of a hook or rod(not included) which aids a shorter person in operating the lock.