Prime-Line Products U 9902 WHT Door Guard, 3-7/8", White SECURITY LOCKING DEVICE  This U 9902 Swing Bar Lock is a security locking device for hinged swing-in doors, allowing a door to be slightly opened to allow safe viewing and ventilation. CHILD-SAFE SECURITY DEVICE  This swing bar lock can also be installed out of reach of children so they cannot open the door by themselves, providing additional child-safe door security. EASY INSTALLATION - Installation is quick and easy  additional security for your doors are within reach! Installation fasteners, including plastic shim spacers for leveling, are included. DURABLE CONSTRUCTION  This swing bar lock is constructed of zinc diecast with a white finish. Its strong and durable, sure to last. PRODUCT INFO  This U 9902 swing bar lock has a long, hinged bar, which folds over the closed door to engage the catch. 3-7/8 bar length x 2-1/2 height.