The 15" Universal Sew Straight Guide is designed to work on both Sew Steady Portable Tables and Sew Steady Cabinet Inserts. Made of 1/8"-thick acrylic, it comes with 2 suction cups to secure the guide to the sewing surface. Also comes with a cling-on Centering Ruler to help line up projects with the needle. Includes notched side to sew 1/4" seam on inside of presser foot.