This new tool, designed by the American calligrapher David Grimes and proposed by Speedball, is a concentrate of ingenuity to simply and quickly draw the calligraphy guidelines. The principle itself is not new, but here everything is very simple to use, rational, easy to transport. Rows of holes spaced with millimetric measurements, a fine pencil tip, and a small plastic triangle that you slide along a ruler... and voila!

Just watch the demo video of the creator of this tool, and you will understand...