Dritz-Omnigrip Non Slip Quilters Ruler. Quilter's Rulers are plastic injection molded rulers with clean, crisp, accurate lines. The molded lines keep fabric from slipping, allowing for fast, accurate rotary cutting. There are 1/2 and 1/4 inch markings and has 30, 45 and 60 degree lines. Black markings. For use with rotary cutters and straight edge blades (items not included). Contains one 16x5- 1/2 inch quilter's ruler with 1/2 inch seam allowance. Made in USA.