ATTENTION PLEASE READ. Stencil plate/Alphabet/Number / Stencil details///[1 inch] Letter size: Approx. 0.1 inch (2.5 mm) Material: Plastic/[3 inch] Letter size: Approx. 2.9 inches (5.1 cm) Material: Plastic/[4 inch] Letter size: Approx. 3.9 inches (10.1 cm) Material: Plastic/[6 inch] Letter Size: About letter size: It is not. Not all the same width.