I used this reamer to ream a series of 1/2" holes for the bronze bushing. I then measured all the holes with an inside micrometer and a set of measuring pins and all the results were <0.001". I used my milling machine to... holding the reamer, which helps a lot to maintain squareness and concentricity. Before using it on my part, I made some test holes and found that by adjusting the speed and type of lubrication I could increase or decrease the size of the holes. I am happy with the tool
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