They are a good tool. Back in the mid 90s our company built a MDF plant which had lots of direct drive couplings. At the recommendation of our head millwright we bought at least 2 and maybe 3 of these, I not sure but I think they were Starrett. They worked well and were still in decent condition when we retired. We gave them along with quite a few smaller tools to some of our top men. I think we had 2 different sizes but I would think yours should be worth at least $50. We retired in 2008 so I don't know how accurate my estimate is. Good luck with it, someone on ebay should jump on it. Jim.
