The jig requires a router fitted with a 30 mm guide bush and 12 mm diameter long reach cutter.
For most common sash mortice and dead locks with up to 3in deep mortices and a 7/8in or 1in. 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 34 mm to 58 mm thick