The Capri Tools Professional 1/4 in. Letter and Number Stamp Set is made from premium components. We use premium Chrome Vanadium steel that’s been differential heat treated to achieve optimal performance and durability: 62 HRC hard stamping end produces high quality imprints and keeps the edges sharp, and 42 HRC tough hammering end excels at absorbing repeated hammer strikes and maintaining durability. Large, true-to-size, and expertly machine letters/numbers ensure the imprints are precise and refined on leather, wood, copper, brass, aluminum and mild steel. Each stamp punch has engraved sizing and identification on the side facing you, making is easy to fine the right stamp and the right orientation. Includes 36 stamps: letters A-Z in uppercase, the ampersand &, and numbers 0-9. Comes in heavy-duty storage cases.