Creative Grids Square on Square 8" Trim Tool Quilting Ruler Template cgrJAW8 Create 4 inch or 8 inch square on square blocks. No calculations 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! Comes with fully illustrated step by step instructions or scan the QR Code printed on the template to view a video demonstration.