Not used yet but missing what identification size bit. I have a box of cutting machines. I wish the shaft had a 3/8 shaft on it or a part number or something. Jonico is written on the shaft. It came in a heavy plastic bag which looks nice but again there is no tag on the bag. I don't use these very much. I would like to know which bit I am using. I can then properly replace if needed, etc. Actually I was trying to bring together some of the work others had done and started with a 1/2" bit that was too big. Second secondary point. The packaging states that the maximum recommended speed is not exceeded. But there is not what it is. It does not include this information with a description of Revain. I think details are important to me.