Innovative ruler track and cutter guide system the special guide on the cutters fits suitablely into the track on the edge of the rulers and prevents the cutter from slipping off course the ruler measures 24 12x6 12 inch and includes 18 inch increments as well as 30 45 and 60 degree angle lines the special guide on the cutters fits perfectly into the track on the edge of the rulers and prevents the cutter from slipping off course