Kua tirotirohia tō tātou kuhitanga whiuwhiaka motokā mo te mahi whaihua matua o ngā motokā, ā, inarangi, pūrangi, me ngā whiuwhiaka tika mō ngā mahi motokā, pūkawe, me ngā mahi whakamomori. Whakatūhia mai i te kōpanga crome-vanadium, e taea ana e ngā whiuwhiaka nei te whakatupu i te whakamahi nui, ā, ko te kōpaki tuwhera ka whakamana i te whakariterite. E pai ana mo ngā mihi tohuwhare matua me ngā hiahia ki te mahi piri, ka tuku tēnei kuhitanga i ngā whiuwhiaka matua katoa mō ngā whakatikatika taumataiti me ngā whakamomori, whakamana i ngā hiahia whakahaere motokā.