Nā Nai
ʻO nā nunui nā nunui i nā nuts maʻamau maʻamau. Ua waihoʻia kahi'āpana Zinc ma luna o kaʻaoʻao o ka carbon steel ma o kahi kaʻina electrolytic. ʻO kaʻili o kaʻili i keʻokeʻo a iʻole keʻokeʻo keʻokeʻo, a loaʻa iā ia nā hana anti-corrosio a me nā hana hoʻonaninani. ʻO konaʻano kahi poʻo hexagonal, kahi'āpana i kauʻia, a me kahi'āpana glavanized, e hoʻopili ana me GB / T 6170 a me nā kūlana'ē aʻe.