"Provides a measurement system for repeated vertical cuts with Saw Trax panel saws. Consists of 2 self-adhesive steel tapes, one stop and strip bar. Strip bar allows customer to make cuts within 1in. of the blade. Tapes are used on both sides of the saw so measurement can be taken from either side. U.S.A. Accessory for Saw Trax Basic models only Standard on all other models"