With the Bosch 2607001375 guide rail adapter, you turn your handheld circular saw into a precise cutting system. When cutting sheet materials or worktops to size, this practical accessory prevents slipping and skewed lines from freehand sawing. You easily slide and secure the adapter directly into the parallel guide slots on your saw base plate for a firm, stable connection. This allows your Bosch gks 190, gks 55, gks 65, or pks series circular saw to glide smoothly and parallel along fsn 70 and fsn 140 guide rails. Achieve straight, clean, and repeatable cuts on every job in the workshop or on-site.