Ka taea te wehewehe i ngā peera roera porotaka kotahi te rarangi, arā, ka taea te wehewehe i te mowhiti peera me te huihuinga roera me te whare herehere mai i te mowhiti kē atu. Kua hangaia tēnei peera hei whakauru i ngā kawenga radial teitei me ngā tere teitei. E rua ngā flange whakauru i te mowhiti o waho, ā, kāore he flange i te mowhiti o roto, ka taea e ngā peera hoahoa NU te whakauru i te nekehanga tuaka i ngā taha e rua.
