I have 5 Vicmark chucks and probably 5 more sets of special jaws. I can't part with them because every once in a while i need them. I was a production turner for a few years and hate having to change jaws, it just slows work down, so I have lots of chucks. I'm glad I bought them when I was working so I could deduct them. You can never have too many chucks or jaws.