Ko ngā peera pōro pana he peera motuhake kua hangaia hei whakahaere i ngā kawenga axial (pana) i ngā tere teitei. Kei roto i ēnei he whāriki peera e rua me ngā awaawa ara reihi me ngā pōro e neke ana i roto i ēnei awaawa. Kāore i rite ki ētahi atu momo peera, kāore e taea e ngā peera pōro pana te whakahaere i ngā kawenga radial, ā, he pai mō ngā tono motuhake kei reira ngā kaha axial anake.
