This listing is: 2.5mm Lowercase Antlia Alphabet Letter Set consisting of Lowercase letters A-Z, as well as the Uppercase set consisting of letter s A-Z, ampersand and exclamation point. This measurement of the lowercase is based on the average size ascender/descender letters. Every letter is not 2.5mm. Please know, based on the actual design of the typeface that the lowercase letters i and j are larger measuring approx. 3.5mm, this is intentional as we try to stay true to the typeface. The Uppercase measuring is based on the average of the ascender/descender letters. Our Sharper Lines and high rockwell hardness rating make it good for use on stainless steel blanks.