Even Houdini kids can not outsmart this childproof door lock, because it is designed to be mounted up high, out of achieve! And because it is 12 times stronger than a deadbolt, it assists in keeping unwanted visitors out whilst keeping little ones in. Rugged metal construction; ideal for exterior and basement doors. Easy to put in (screw it into the door jamb) and use (simple pull to release). For childproofing and home security. Recognized as some of the highest new child safety products by the National Secure Kids Campaign, a no longer-for-profit dedicated to preventing childhood injuries 3″L x 2 1/2″W x 1 1/4″H Installs in 5-10 minutes. Screws included; drill and screwdriver required.