ʻO ka hana ʻana i ka metala he kaʻina no ka hoʻololi ʻana i nā ʻāpana palahalaha o ka metala i nā ʻano like ʻole a me nā ʻano nui me ka hoʻohana ʻana i nā ʻano hana like ʻole, e like me ke ʻoki ʻana, ka kuʻi ʻana, ka wili, ka riveting, a i ʻole ka hana make.