Quilting RulersQuilting rulers are thick, clear acrylic tools featuring precise grid lines, angle markings (30, 45, 60 degrees), and 1 8 inch increments, designed for safe use with rotary cutters. They enable accurate fabric cutting, trimming, and squaring up blocks, often featuring non slip coatings to prevent shifting. Essential sizes include a 6" x 24" for long cuts, a 6. 5" x 12. 5" for wider strips, and a 6. 5" or 9. 5" square for squaring up.