The shape of a particular fiber determines its distinctive qualities, and central to the distinctiveness of each fiber is the precision of the holes, which can be as small as 100 microns, through which petroleum-based materials are squeezed to become chemical fibers. Akinori Katayama has been designated a "modern master craftsman" by the Ministry of Labor. He files and polishes unique tools made of ultra-hard alloys up to the thickness of a strand of human hair that are used to drill these holes into nozzles.