These can be used on your router to cut any inlay material so that it fits perfectly into the matching recess. Using a pattern and a 1/4" straight bit (neither included), the recess is cut with the inlay bushing in place. The bushing is then removed to cut the profile of the inlay again with the pattern.
Each contains a 7/16" template guide, a ring nut, and a 7/16" inlay bushing with a hex key. All guides are solid brass. The 1 3/4" set is for use with the Veritas base plate/table insert or 1 3/4" counterbore insert; the 1 3/16" size is for a standard router base plate with a 1 3/16" through bore and a 1 3/8" counterbore ( all Porter-Cable and Black & Decker base plates as well as some from DeWalt, Elu, Hitachi, Makita and Skil).