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 thatβ¦