DRITZ-Omnigrid: Non-Slip Ruler. The clear acrylic ruler has a special non-slip bottom surface to help keep the ruler still and in place when measuring or cutting. The markings are in inches with 1/8-inch increments. 30- 45- and 60-degree angle lines are included in both directions for left- and right-handed crafters. Overall measurements are 12-1/2x2-1/2 inches. This package contains one ruler. Imported.