The Makita Parallel Guide (1913K7-3) is for use with Makita Guide Rails including the 118" Guide Rail (194367-7), the 55" Guide Rail (194368-5), and the 39" Guide Rail (199140-0), all sold separately. The Parallel Guide allows for a long ruler to be set parallel to any position from the end face of the material. The 1913K7-6 provides for precision cuts when panel cutting. It features one touch mounting of the under guide on the back side of the parallel guide. The Parallel Guide features easy installation by hooking the adapter into the groove of the guide rail and pushing the slider to secure it to guide rail. It is made of high quality materials for long life.