I.Chigadzirwa Nhungamidzo:
Chigadzirwa chacho chine sampuli sampuli uye gumi akasiyana saizi yeiyo Center Plate, yakakodzera (0.1 ~ 0.08) Yakashandiswa zvakanyanya mupepa, kurongedza uye zvigadzirwa zvemhando yepamusoro uye maindasitiri ekuongorora nemadhipatimendi. Icho chinhu chakakosha chekuyedza kuridza mhete simba repepa uye kadhibhodi.
u no.1 0.100-0.140 mm
UN.A2 0.141-0.170 mm
U Kwete .3 0.171-0200 mm
U.4 0.201-0330 mm
U Kwete .5 0.231-0280 mm
U Kwete .6 0.280-02 mm
U Kwete .7 0.321-070 mm
U Kwete .8 0.371-02 mm
U.9 0.421-0.500 mm
u kwete.10 0.501-0.580 mm