Hi ICON, I found the insulator on the right recently and probably would have left it except for the size of the embossing. The one on the left is the same CD 155 with the same embossing except for the size of the letters. My question is: are these the smallest letters used to emboss an insulator and if not what is., and what is the largest (letter size) used to emboss an insulator. Special thanks to Bill cause he already knows the answer. Billy