Features General Purpose For medium- and light-duty marking. Capable of imprinting metals up to a hardness of 15 Rockwell C. Steel Hand Stamps Use to permanently mark tools, components, locks, and various metals. Character and size are indicated on the thumb side. Character Height / 3/8 in Shank Length / 2 13/16 in Shank Size Square / 1/2 in Material / Steel Hardness / 58 to 62HRC at the Engraving End and 38 to 46HRC at the Striking End Case Material / Plastic Impression Letter Type / Standard Includes / (36) Pieces - A thru Z, an Ampersand and 0 thru 8 with 6 Serving as 9