The fit and finish of the tool holders was mediocre at best. A few non-critical edges looked hastily hand-finished and uneven. There is no part number in the product listing for this tool for the shim that sits under the carbide and the first time I used it the insert broke, the loose part pulled into the shim and broke it as well. I can't find a part number for the customer, so the tool is useless now. The last straw for me was that I tried to get more information from the manufacturer's website (printed on the container the tool came in) and instead of a CNC website I ended up on a horrible Chinese porn aggregator website . No thanks, I'm returning the instrument to a more reputable brand.