3. ʻŌmole Elliptic: he huahana hou ka ʻōmole elliptic i hoʻolauna ʻia i nā makahiki i hala iho nei. Ke hoʻohālikelike ʻia me ka ʻōmole poepoe, he kūpaʻa maikaʻi loa ke kaomi o ka ʻōmole elliptic. Eia nō naʻe, no ka mea, ua hana ʻia ka ʻōmole elliptic i kēia manawa me ka lipine galvanized, ʻoi aku ka haʻahaʻa o kāna hana anti-corrosion ma mua o ka ʻōmole poepoe.
4.Profile Steel: hoʻohana ʻia ia ma luna o ka hale kōmahana akamai e hana i kahi kiʻikuhi kila. Loaʻa iā ia ka pono o ke kumukūʻai haʻahaʻa a me ke kūpaʻa haʻahaʻa i hoʻohālikelike ʻia me ka paipu huinaha. Hoʻohana nui ʻia ia ma nā wahi me nā koi haʻahaʻa haʻahaʻa a me ka pale ʻana i ka palaho.