He wāhanga rarangi kotahi, rarangi rua rānei ngā huihuinga roera ngira me ngā huihuinga whare herehere kei roto ko ngā whare herehere me ngā roera ngira. Nā te mea ko te teitei hoahoa radial anake e rite ana ki te diameter o ngā roera ngira, ka taea te whakamahi i ngā huihuinga roera ngira me ngā huihuinga whare herehere hei hanga i ngā peera me te iti rawa o te hoahoa radial. He wāhanga katoa ēnei kei roto ko te whare herehere me ngā roera ngira.
