Prime-Line F 2590 Sash Lock for Vertical and Horizontal Sliding Windows &ndash; Replace Broken Sash Locks for Additional Home Security, 2-1/4&rdquo; Mounting Hole Centers, White Diecast WINDOW SASH LOCK  This window sash lock includes one cam-action latch with fasteners and can be used on a variety of aluminum-framed sliding windows. The lock does not use a separate keeper, instead, the latch engages into the fixed rail to lock the window. REPLACEMENT PART  Use this window sash lock to replace old or broken window locks to maintain security in your home. EASY INSTALLATION  Installation is quick and easy, and the sash lock can be used on vertical, single and double hung aluminum sliding windows. These locks will also fit some horizontal, aluminum-framed sliding windows. DURABLE  Made of diecast zinc with a white painted finish, this sash lock is strong, durable and made to last. SIZING - This sash lock has 2-1/4 mounting hole centers with a 3/8 latch projection that engages into the fixed rail of the top sash.