Defender Security U 9929 Double Hung Wood Window Flip Lock, 1 in. x 2 in. x 7/16 in., Steel, Antique Brass, 2-Pack Used on vertical sliding wood windows as a secondary lock to block lifting of lower sash 1 in. wide x 2 in. tall x 7/16 in. deep Antique brass finish Stamped steel construction Used on vertical sliding wood windows as a secondary lock to block lifting of lower sash 1 in. wide x 2 in. tall x 7/16 in. deep Antique brass finish Stamped steel construction