Pushbutton Lock 1150-DC-MG-L has mechanical keyless heavy duty lever lock on both inside and outside and Marine Grade finish. It is dedicated to left-hand door. One user code with thousands of possible combinations works as a lock key. The Pushbutton Lock is very easy and quick to install - installs in minutes with EZ plates and very easy to change code. Comes with adjustable backset deadlocking spring latch. Mounts in standard 2 1/8" hole. For thicker doors, an Extension Kit is available - extensions for doors up to 5? in width. The 1150-DC-MG-L has Magnet Proof – Lock cannot be manipulated with magnets, also Passage Function (ability to leave door unlocked) and changeable/reversible handing.