The jig requires a router fitted with a 30mm guide bush and 12mm diameter long reach cutter.
For most common sash mortice and dead locks with up to 3in deep mortices and a 7/8in or 1.in face plate.
Deeper mortices can be achieved with a suitable size of auger bit.
Also suits face plate on a 1.in mortice latch.
NOTE. Use on doors 34mm to 58mm thick