This square patchwork rule of 8.5 "x 8.5" (21.59 cm x 21.59 cm) includes black and white markings that are easy to read printed in 1 "" marked by 1/8 "and 1/4 increments ". Use easy -to -read digital black numbers (printed on white points) and 1/4" gripping sides to cut whole thumbs. These 1/4 "gripping sides accentuate the dotted lines printed at 1/4" on two adjacent sides. Use the patented turn-a-round function-designated by the easy-to-read digital figures (printed on black dots) and the 1/2 "gripping sides- to add the 1/2" sewing. Our exclusive coating keeps the fabric during the cut when the pressure is applied. An angle of 45 ° is printed in black. White horizontal and vertical lines are printed on the square so that the center of the rule is easily visible.