Ngā taputapu porowhita kore-hurihuri ritenga mō ngā diameter DIN5-7 m0.5-m30 kia rite ki ngā whakaritenga a te kiritaki, he kōpikotaputapu pikome te koki porowhita kore. Nā te mea he āhuatanga ōna o ngā taputapu piko tika me ngā taputapu piko, he rite tonu te kaha ki te mata o te niho ki tērā ongā taputapu piko tika.

Ko ngā painga o ngā taputapu kore-piko ko:

1) He rite te kaha e pā ana ki te taputapu ki te kaha o te taputapu piko tika.
2) He kaha ake, he iti ake te haruru i ngā taputapu porotaka tika (i te nuinga o te wā).
3) Ka taea te huri i ngā taputapu hei hanga i ngā taputapu tino tika.