The Prime-Line U 9927 key sash lock adds an extra layer of security for sliding window, preventing unauthorized access. Ideal for child-proofing high elevation windows, ensuring peace of mind in your home. This sash lock can only be unlocked with the provided key, making it a reliable childproof lock for vertical and horizontal window key lock systems. Perfect for keeping curious kids safe indoors. Built with strong, diecast zinc, this window lock offers lasting durability with a beautiful brass finish. It is designed for use on aluminum, wood, or vinyl sliding windows. Installation is a breeze with all fasteners included. A Phillips head screwdriver is all you need to mount this lock for windows securely on vertical or horizontal sash frames. The slide window lock has a 5/8-inch narrow keeper and 2-inch mounting hole center spacing. For further dimensional information, please see the line drawing before purchasing.