Create 3 inch or 6 inch Square on Square blocks. No calculation needed - all the cutting measurements are printed right on the tool! Trimming each round as triangles are added creates perfectly square, uniform blocks. The popular Snail's Trail block is now easier than ever - simply change the colors of the triangles! The template comes with fully illustrated step by step instructions or scan the QR Code printed on the template to view a video demonstration. The ruler slides easily over the fabric until pressure is applied. Then, our exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts! Total Size - 6-1/2in x 6-1/2in Creative Grids® products are made in the USA and sold in independent quilt shops only.