This keypad day and night lock works on the basis of magnetism. When the door is closed, the latch bolt is pulled out by magnets, locking the door. The door is simply opened with the door handle, but when it is open, the latch bolt no longer extends. Unique to this lock is the patented blocking mechanism which makes the deadbolt unnecessary. This not only ensures a smooth finish, you also prevent damage to the frame or that you unexpectedly get behind it. This lock has a keyhole size of 55 mm, a backset size of 50 mm and comes with 2 keys, a locking plate and a stainless steel brushed front plate with a size of 174 x 20 mm (hxw).