Our easiest-ever lever lock! No need to dismantle your door handle, no need to install more hardware! This unobtrusive French door lock installs right over the existing door handle and secures with adhesive, not screws. Straightforward push-and-twist release. With visual indicator, so you know it"s locked! Unlike other lever locks, you don"t need to dismantle your door handle to install Push the button and twist the device to unlock. When unlocked, the latch rotates with the natural motion of the door lever. Can be used on right or left facing handles, thanks to the rotating "C" ring design SecureTech™ visual indicator provides added safety and peace of mind for parents. (When the latch is engaged, the gauge turns green; when the latch is unlocked, the gauge turns red.) 2 1/2"H x 4 1/2" Diam.