Letter punch set A thru Z - 1.5mm impression (1/16") The letters are block upper case (Franklin Gothic). A very useful addition to your bench. Though economical, these punches are made of tempered steel and will be useful for years. The punches are approximately 2-3/8" long and comes in a wood storage box can help you keep organized up to 27 steel design punches. The holes are 3/8" in diameter to hold a variety of sizes. The hinged lid features a magnetic closure. Overall dimensions of the box are 7-1/2" x 3-1/2" x 3-1/4"H. The ideal surface for stamping is a Bench Block to get well defined, crisp letters or shapes.