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! The template comes with fully illustrated step by step instructions or scan the QR Code printed on the template to view a video demonstration. Creative Grids Rulers have a MAP (Minimum Advertised Pricing) Policy. Please do not advertise them for less than the suggested retail.