Grace Company TrueCut Ruler 6-1/2"X12-1/2- Innovative Ruler Track and Cutter Guide system 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 The ruler measures 12-1/2x6-1/2 inches and includes 1/8-inch increments as well as 30- 45- and 60-degree angle lines