Smart door lock! It clamps on without drilling, is accessible from both sides of the door, and may be disengaged entirely once kids are in bed. Unlike conventional doorknob locks, it"s placed high out of reach, foiling little Houdinis who can outwit standard safety locks. Plus, it doubles as a door pinch guard, protecting chubby fingers. This Safety 1st door lock won"t mar your door or woodwork when you remove it. Tightens in place with an Allen wrench (included). Folds out of the way when not needed for convenience Top of door lock measures 9"L x 3"W x 2 1/4"H