Dritz-Omnigrip Non Slip Quilters Ruler. Quilter's Rule 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 markings and has 30 45 and 60 degree lines. Black markings. For use with rotary cutters and straightedge blades (items not included). Contains one 16- 1/2x16-1/2 inch quilter's ruler. Made in USA.