Create perfect 3" and 6" finished square-on-square blocks with this precision trim tool from Creative Grids®. Designed by Jean Ann Wright, it simplifies Snail's Trail quilts and lets you customize designs by changing triangle colors. The USA-made acrylic ruler features Creative Grids' signature non-slip grip that holds steady when pressure is applied, preventing slipping during cuts. Black and white markings and printed measurements make it easy to read and use. Simply align the centering square over your block's center, trim two sides, rotate, and trim the remaining two sides. Includes step-by-step instructions and a QR code linking to video tutorials. Measures 6½" x 6½".