The sub-compact 6-1/2” Circular saw guide rail adapter is an ideal accessory for precise and accurate cuts when used with Makita sub-compact Circular saws and guide rails (sold separately). the adapter allows Makita 18V sub-compact LXT Circular saws to be used with Makita 55” and 118” guide rails, as well as select competitor rails (all sold separately). contractors are learning that cutting with a circular saw and compatible guide rail is a more portable option to a table saw for ripping sheet material.