These Defender Security Aluminum Secondary Window Locks (4-Pack) are used to secure your window in an open, ventilating position. The locks feature a nice natural finish. Extruded aluminum lock with steel thumbscrew used on metal horizontal sliding windows. For heavier-duty locks see item no's U-9800, U-9802, U-11127, U-11128, U-9810 or U-9812. Finish by tightening thumbscrew with pliers to securely lock windows in closed or ventilating positions. For non-marring locks see no's U-9820, U-9821, U-10876 and U-10551. For vinyl windows use U-9809 or U-10547.
- Fits rails up to 1/8 in. thick
- Aluminum construction with natural finish
- Allows window to lock in ventilating position
- Secondary lock
- Easy to install