HHIP 3/8" Character Width Number & Letter Stamp Set 0-9 and A-Z. Character size is 3/8" and stamp shank width is 1/2". Hardened to RC 59-61 at tip and tempered to RC 40 Rockwell at the striking end. Made from carbon steel. Character style is designed to give sharp clear impressions. Packed in a durable box. Easy selection and storage.