NASCO makes a 5 number tattoo plier - doesn't help you much though! If you are talking Maines many people put the herd prefix (say XYZ) in one ear and the number/year letter in the other (say 12J). You can either buy 2 pliers - one for the herd prefix that you don't change and the 2nd for the number and letter - or you could buy one pair and continually change the numbers - don't think you are going to find one for 6.