The Riley Blake Designs by Lori Holt - Trim-It Non-Slip Ruler Square 8.5 x 8.5 is a versatile quilting tool designed by Lori Holt of Bee in my Bonnet. This ruler features diagonal lines for easy block centering, colored outside 1/4-inch seam allowance marks, and 1-inch grids marked in 1/8-inch and 1/4-inch increments. It is perfect for trimming blocks after piecing, applique, or embroidery projects. The ruler's non-slip design ensures precision and accuracy in your quilting projects, making it a must-have for any quilting enthusiast.