I'm going to start a thread about this. I know nothing about it. I'm curious that all the shafts must come the same length so why do they have an iron number stamped on the end of the shaft? Don't you just butt cut them to the length for a 4,5,6 iron?
If so these have 6 shafts that go in order and 2 that are odd ( 35.75 and 33.75). I should look at them again, I wonder if some were never cut and used therefore there are gaps.