ʻO nā kila honua, 50 a 60% ka mea i hana ʻia i ka metala, ʻo ka hapa nui o ia mau huahana i hoʻopaʻa ʻia a paʻi ʻia. ʻO ke kino o ke kaʻa, ka ʻāpana radiator, ka pahu mahu o ka paila mahu, ka pahu o ka ipu, ke kila silika hao o ka motika uila a me ka mea uila, a pēlā aku. Nui nō hoʻi nā ʻāpana stamping i nā mea kani, nā mea pono hale, nā keʻena dulls, nā mea mālama a me nā huahana ʻē aʻe.