The milling template for Nemef 4139 mortise lock. With this tool you easily make the recess of the lock case of a nemef 4139 mortise lock in the door. This jig is used in combination with a jig for nemef 1200 mortice locks for plate, handle & cylinder. This L-shaped jig has an adjustable side. It can therefore be used on any door thickness. The two cams at the bottom of the jig form the contour of the lock's front plate. Therefore this jig fits only one way on the door.