The Windobully adjustable lock universally fits any sliding window or glass door. Installs in seconds with no tools required, for added home security, child safety, pet entry, or just letting in the fresh air. With the Windobully you get piece of mind knowing windows and doors will remain secure. Multiple settings allow you to lock window or door from the closed position to up to 5 inches open. Comes with convenient holder to store lock when windows are all the way up. Track and lock system break-in force tested up to 300 pounds.