I have this one for the small sizes. Shows number and measured size for each from 1-60. I’d also recommend getting a number zero or number one center drill to start the holes so the drill doesn’t wander and drill straight without breaking. Just need to use the center drill to put a dimple in the brass that the drill can use as a guide to get started. There can be a trick to drilling small holes. You need to be patient and pet drill clearing the flute often.