SECONDARY SECURITY LOCKING DEVICE – This Defender Security U 9846 Patio Sliding Door Loop Lock can be used on a patio sliding door as a secondary security lock for increased home safety. CHILD-SAFE SECURITY DEVICE - This door loop 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 home or office doors are within reach! Installation fasteners are included. DURABLE CONSTRUCTION – This door loop lock has a hardened steel locking bar with diecast constructed mounting plate and keeper, with a nickel-plated finish. PRODUCT INFO - This locking device features a 2-1/8 inch reach, which is designed to secure the door to the jamb. Used on patio sliding door systems as a secondary security locking device 2-1/8 in reach Chrome plated finish Hardened steel locking bar with diecast constructed mounting plate and keeper