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.