WINDOW LOCK - Use this lock to secure metal horizontal sliding windows in a closed or ventilating position | SECURE - The thumb turn screw of this sliding window lock secures the lock in place | INSTALLATION - Easily install this secondary lock with no tools required | DIMENSIONS - The secure lock has a natural finish and can fit up to a 1/8 inch wide rail | NOTE - Please refer to the line art drawing for dimensions and compare with your needs before purchasing