See the KREG Concealed Hinge Jig in action in the video below:
The KREG® Concealed Hinge Jig makes installing concealed hinges a matter of seconds. There is no need to figure out dimensions, distance between holes and to the door edge. Everything is laid out in the jig. Only a hand drill is needed.
The jig is simply positioned using the fence to then be clamped in place. The carbide-tipped bit (included) is then attached to the drill and the standard 35mm hole is made in a matter in seconds. The two holes for the fixing screws are also well marked in the jig so that after three holes and without measuring any distance, you are done installing the hinge.
The jig is easy to use and ensures accuracy and consistency.