A kit for forming mortises in door edges and door frames for flush-mounting door hinges, strike plates and latch plates is provided. The kit generally includes a template holder and a plurality of templates mountable to the template holder. The templates provide guides for various size hinges, strike plates or latch plates. The template holder includes an adjustment mechanism for easily adapting the template holder from doors having a first thickness to doors having a second thickness. The adjustment mechanisms include a rotatable cam and knob. The kit may optionally include an alignment schedule providing distances for locating the templates relative to a door end or a frame. Further, the templates may include tab engagement slots for engaging a tape measure.