A guide rail system is a more portable solution for precision cutting, so get the right accessories for use with your Makita 55” and 118” guide rails. The guide rail adapter (198673-2) is an innovative solution for accurate cutting when used with the Makita 5” masonry saw model 4100Kb and guide rails (saw and rails sold separately). the guide rail adapter installs quickly and easily, and is engineered with quality materials for long service life.