This 2-1/2 inch x 24-1/2 inch rectangle ruler is the perfect size! It fits cleanly on your mat without any overhang, and cutting directly off the bolt has never been easier! The ruler 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 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.