The backset of the FHC J4504 Commercial Door Deadbolt Lock Body is 1-1/8 inches. This lock is designed for use on commercial aluminum or steel doors, featuring a single-point deadbolt with secondary anti-jimmy expanding bolts and a sturdy steel housing. It’s a reliable replacement for the W and F series 6000 or comparable locks, and all necessary mounting hardware is included for a quick and easy installation.