Use the Prime-Line U 9846 Sliding Door Loop Lock on screen door systems as a secondary security locking device. It can be used as a child safety device. Easy to install and used by many, the safety lock comes with mounting hardware is included. A Phillips head screwdriver is required for Installation. Constructed of a hardened steel locking bar and a diecast mounting plate and keeper, the security lock has a nickel plated finish. The screen door lock features a 1-1/8 inch reach that is designed to secure the door to the jamb for increased safety of the home. For further dimensional information, please see the line drawing.