I agree on the hole transfer punches. I have 3 sets & some are very good some are kinda "like a box of choclats". all of Chinese origin.
But I do have a couple different sets of "powerfist" letter & # stamps that I have used a fair bit and they are holding their cymbals nicely. I do have a "machinist" set of much better quality...the major difference between the two is the quality of cymbal, a much finer,sharper cornered result using them.