Groz Engineering Tools [P] Ltd manufactures Letter and Number Steel Stamps. Groz Engineering Tools [P] Ltd. Is an ISO 9001:2000 certified company. In Letter and Number Steel Stamps, punches are through induction hardened, which give durability and extended life for repeated use. The hardeness, at the stamping end is maintained at 58-62 HRC, the striking end is tempered to 38-43 HRC. This prevents the punch from splintering during use. The striking end is chamfered to prevent breakage and accidents due to flying splinters.
