REPLACE ANTIQUE MORTISE LOCK SETS – The vintage look of the Prime-Line Mortise Lock Assembly Kit is a great match for the old lock sets found in period homes. Used with antique and vintage door hardware, the kit is an economical replacement for indoor mortise locks. EASY INSTALLATION – Installation is quick and easy, and all mounting screws are included. The mortise lock easily slides into the existing door pocket for an fix for a broken lock. It has a 2-3/8 inch backset with a 9/32 inch square spindle drive that accepts a maximum spindle size of 1/4 inch. STEEL WITH BRONZE FINISH – The mortise lock is constructed from case-hardened steel and features a faceplate with a bronzed finish. The kit includes a latch and deadbolt strike with fasteners (door knobs, square spindle, spare keys and trim plates sold separately) and two skeleton-style keys. LEFT OR RIGHT-HANDED INTERIOR DOORS – The mortise caselock ships handed (to close in a certain direction) but the latch can easily be reversed for opposite swinging doors. INSTALLATION TIP – Although the square drive on the latch has a 9/32 inch opening, it will only accommodate 1/4 inch square spindles.