This 8-1/2 x 12-1/2 inch rectangle ruler features easy-to-read black and white markings printed in 1 inch grids marked in 1/8 and 1/4 inch increments. Use the easy-to-read, 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 – designated by the easy to read, numerical white numbers (printed on black dots) and the 1/2 inch grip sides – 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. An additional black 45 degree line is placed so that two angles cross 1/4 inch away from the outside edge. Use these markings to square up flying geese units; squares set on point or mark cross-hatching. The ruler also features a 30degree/60degree angle. White horizontal and vertical lines are printed on the rectangle so the center of the ruler is easily distinguishable. Use these lines to fussy cut stripes and borders. The ruler slides easily over the fabric until pressure is applied. Then, our 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. This 8-1/2 inch width is also available in 18-1/2 inch (Item CGR818) and 24-1/2 inch (Item CGR824) lengths. Total Size - 8-1/2in x 12-1/2in Creative Grids® products are made in the USA and sold through independent quilt shops as well as select online retailers.