Manufactured from select quality carbon steel Individual Punches are through induction hardened, which imparts durability and extended life for repeated use Hardness at Stamping end: 58−62 HRC Hardness at Striking end: 38−42 HRC. This prevents splintering of the punch Chamfered striking end prevents breakage and accidents due to flying splinters Number Punch Set contains 9 pieces – ‘0’ to ‘9’. Numbers ‘6’ & ‘9’ are interchangeable Letter Punch Set contains 27 pieces, alphabets ‘A’ through ‘Z’ and ampersand