Creative Grids 4.5" x 12.5" Rectangle Quilting Ruler Template CGR412 Features easy-to-read black and white markings printed in 1 inch grids marked in 1/8 inch and 1/4 inch increments Use the black numbers (printed on white dots) and the 1/4 inch grip sides to cut whole inches. The 1/4 inch dashed lines printed on two adjoining sides aid in trimming seam allowances. Use the patented Turn-A-Round feature to add the 1/2 inch seam allowance. Use the white 45 degree angle to trim half-square triangles in whole inch increments. Use the black 45 degree angle to trim half-square triangles in half inch increments. Exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts. Scan the QR Code printed on the ruler to view a tutorial of these features.