Number Set Character Height 1/8 In. Shank Length 2-3/4 In. Shank Size Square 3/8 In. Material Steel Hardness 58 to 62HRC at the Engraving End and 38 to 46HRC at the Striking End Case Material Plastic Indication Character and Size are Marked on Thumb Side Includes (9) Pieces - 0 thru 8 with 6 Serving as 9 Standards Federal Specification GGG-D-280C