Adams Rite 4810 Strike template with Dust Box mortise included.
Finish mortise size of 1.031 x 4.0 using a standard 1/2” cutter and a 5/8” template guide on your router, mortising without the red block-off tabs in place. Then changing to a 3/16” cutter, or another router with a 3/16” cutter and a 5/8” template guide you will mortise between the red block-off tabs to get the deep mortise (.843 x 2.575) for the dust bucket.
Template will have two nail attaching assemblies to hold the template to the jamb.

Stock Number: Adams 4810 strike