This 20-1/2in square ruler from Creative Grids® is a great size for working on larger blocks, T-shirt quilts, and for squaring up quilt corners. · Made in the USA with high quality acrylic and precision measurements ensuring accuracy for your quilting, sewing, patchwork, and crafting projects. · Creative Grids® exclusive non-slip grip allows you to easily slide the ruler over the fabric until positioned correctly. Then, when slight pressure is applied, the grip holds the ruler in place, eliminating slipping while you cut. · Easy to read black and white markings are printed in 1in grids marked in 1/8in and 1/4in increments. · Use the black numbers printed on white dots and the 1/4in grip sides to cut in whole inches. · Use our exclusive Turn-a-Round feature to cut easily cut in 1/2in increments by following the white numbers on black dots and 1/2in grip sides. · The 1/4in dashed lines that are printed on two adjoining sides aid in trimming seam allowances, and the 45 degree diagonal line makes trimming half-square triangle blocks easy and accurate. · White horizontal and vertical lines are printed on the square to show the center of the ruler. Use these lines to square up blocks based on four-patches, embroidered, and appliquéd blocks. · Scan the QR Code to view a tutorial video on these features and to see the patterns that can be made with this ruler. Total Size: 20-1/2in x 20-1/2in Creative Grids® Rulers are made in the USA and sold through independent quilt shops as well as select online retailers. Creative Grids® products have a MAP/IMAP (Minimum Advertised Price/Internet Minimum Advertised Price) Policy. Please do not advertise them for less than the suggested retail price.