Product Description This is an extruded aluminum lock with steel thumbscrew used on metal horizontal sliding windows. Allows you to lock window in the closed or ventilating position. It can fit up to a 1/8 inch wide rail. Comes in a natural aluminum finish. From the Manufacturer This secondary lock is constructed of aluminum and is used to lock your window in an open, ventilating position. It can fit up to a 1/8 In. wide rail. Comes in a nice natural finish. 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