Back to Back Mechanical Pushbutton Lock with Knobs - 2-3/4" Backset - Satin ChromeDormakaba Back to Back Mechanical Pushbutton Lock with Knobs 2 3 4" Backset Satin Chrome Fully Mechanical Lock Eliminates the Material and Labor Expense of Battery Replacements Single Access CodeOne Easy to Manage Code for All Users Vandal Resistant, Solid Metal Pushbuttons Lock is Easily Programmed Via Keypad Without Removing Lock From the Door 3 Hour UL ULC Fire Rating for "A" Labeled Doors