OurLetter and Number Punch Set is spring loaded to allow easy adjustment of the exact tension needed to make your mark on wood or soft metal. Insert one of the dies in the spring loaded handle and press down to punch a permanent mark. The set contains 26 letters, 9 numbers, decimal point and ampersand (&) in a plastic storage case. The handle is made from brass and steel, and the characters are hardened tool steel. The letters and numbers are 5/32˝ high x 9/64˝ wide.