The quilting rulers triangle shaped can be used to produce any pattern based on 30 degree or 60 degree angles up to a height of 12 inches. The Embedded Gripper Dots on Equilateral Triangle Quilt Ruler, holds the fabric while cutting, to avoid any slipping or untidy cutting. The Creative Grids 60 degree ruler easily slides over fabrics until pressure is applied. A 1/4 inch dashed line is printed on each side of the center vertical line on this triangle sewing ruler, so you can cut 30 degree triangles that include the seam allowance. The Creative Grids 60 degree triangle ruler comes with fully illustrated step by step Instructions. Easy-to-Read black and white markings after every 1/4 inch makes it a perfect 60 Degree Quilting Ruler. Creative Grids Quilting Rulers and products are made in the USA.