Defender Security U 10551 Sliding Window Lock, Aluminum, Mill

This sliding window lock is constructed of extruded aluminum with a non-marring vinyl insert and a steel thumbscrew and it comes in a milled aluminum finish. The design of this lock is manufactured to fit on older style, metal framed windows - usually of single pane glass. These locks will not work with modern vinyl windows, as the vinyl inserts have only a narrow 1/4 in opening. For vinyl windows consider using Prime-Line parts U-9809 or U-10547. Once the lock has been mounted and hand-tightened, finish by tightening thumbscrew with pliers to securely lock windows in closed or ventilating positions. These locks are easy-to-install and are used by many to increase the security of their home.