Prime-Line U 9819 Aluminum, Sliding Window Security Lock (4 Pack)

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.
WINDOW LOCK: Use this lock to secure metal horizontal sliding windows in a closed or ventilating position
SECURE THUMB TURN SCREW: The thumb turn screw of this sliding window lock secures the lock in place
EASY INSTALLATION: Easily install this secondary lock with no tools required
DIMENSIONS AND FINISH: The secure lock has a natural finish and can fit up to a 1/8 inch wide rail
COMPATIBILITY NOTE: Please refer to the line art drawing for dimensions and compare with your needs before purchasing (Not Universal)
DURABLE CONSTRUCTION: Made from extruded aluminum with steel thumbscrew for long-lasting performance on metal horizontal sliding windows
VERSATILE LOCKING POSITIONS: Allows you to lock your window in either the fully closed position or in a ventilating position for added flexibility