Letter & number punches. Used for hand marking metals & other hard materials. Useful for stamping personal identification or post codes on tools, cycles etc., as frequently recommended by police & insurers. The letter or number sizes as shown, relate to the height of the characters. Punches are manufactured from high quality tested carbon steel with double induction hardened heads to ensure high quality impressions. The body is hardened & the head is tempered to prevent chipping when hammered. Contains 1.2, 3.4, 5.6, 7.8, 9.0 (9 is achieved by reversing 6). Supplied in a plastic box.