Craftool� stamps are an investment that will last for years to come! Geometric stamps are used for many decorative and special effect purposes. With just one geometric tool, you can cover a large area with a nice design in minimal time. Our book, "Tech Tips" #66056-00 by Al Stohlman, shows some examples of designs created with geometric stamps. "Luck 8 Belt Book" #6051-00, also has some good geometric design examples. Approx. stamp dimensions: 5/16x1/4.