I.Hōʻike huahana:
Loaʻa ka huahana i kahi kumu hoʻohālike a me ʻumi mau kikoʻī nui like ʻole o ka pā waena, kūpono no (0.1 ~ 0.58) mm mānoanoa o ka hāpana, he 10 mau kikoʻī, me nā papa waena like ʻole, hiki ke hoʻololi i ka mānoanoa hāpana like ʻole. Hoʻohana nui ʻia i ka hana pepa, ʻeke a me ka nānā ʻana i ka maikaʻi o nā huahana a me nā ʻoihana nānā a me nā keʻena. He mea hana kūikawā ia no ka ho'āʻoʻana i ka ikaika hoʻopaʻa apo o ka pepa a me ka pepa pahu.
u No.1 0.100-0.140 mm
u No.2 0.141-0.170 mm
u No.3 0.171-0.200 mm
u No.4 0.201-0.230 mm
u No.5 0.231-0.280 mm
u No.6 0.281-0.320 mm
u No.7 0.321-0.370 mm
u No.8 0.371-0.420 mm
u No.9 0.421-0.500 mm
u No.10 0.501-0.580 mm