Pushbutton Lock 2835-MG is mechanical, keyless lever lock with Marine Grade finish. Lever handle is installed on exterior and interior side of the lock body. 2835-MG has auto-locking with passage function, adjustable latch and reversible handing. It is dedicated to exterior or interior using. Mounts in standard 2 1/8" hole. One user code with thousands of possible combinations works as a lock key. The mechanical pushbutton lock requires no wires, batteries or electricity. Locks fit doors 1 3/8" to 2" thick with a 1 1/8" backset. The Pushbutton Lock is very easy and quick to install - installs in minutes with EZ plates and very easy to change code. For thicker doors, an Extension Kit is available - extensions for doors up to 5? in width. These provide keyless security, fit most doors and are weather resistant.