WINDOW LOCK – Use this lock to secure metal horizontal sliding windows in a closed or ventilating positionSECURE – The thumb turn screw of this sliding window lock secures the lock in placeINSTALLATION – Easily install this secondary lock with no tools requiredDIMENSIONS – The secure lock has a natural finish and can fit up to a 1/8 inch wide railNOTE – Please refer to the line art drawing for dimensions and compare with your needs before purchasing