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It seemed that the product size tolerance was a very small lot, and it was an error of 5/1000 mm or less. It was cheaper than a no-brand square bar. Although the maximum outer diameter of the free cone currently used is about 70 mm, this bar can drill even with an outer diameter of 100 mm or more. Moreover, it was possible to remodel the high-speed steel also to the 2-blade free cone. Metal drilling which is thicker than the original free cone also became possible.