This 4-1/2 inch square is the perfect companion for anyone who loves to work with the 5 inch pre-cuts on the market. The diagonal line makes trimming half-square triangles created with these 5 inch squares a piece of cake. It features easy-to-read black and white markings printed in 1 inch grids marked in 1/8 and ¼ 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 https://youtu.be/IC_NXAsw4HY