ʻO ka hopena hope loa e hahai i ka maʻamau AASHTO M180, GB-T 31439.1-2015 a me EN1317.
ʻO ka mea nui no ia ka Q235B (S235Jr ka ikaika hua ma mua o 235Mpa) a me Q345B (S355Jr ka ikaika o ka hua ma mua o ka 345Mpa).
No ka mānoanoa o ka hopena hopena ma o ka 2.5mm a 4.0mm a i ʻole e hahai i ka koi o nā mea kūʻai aku.
ʻO ka hoʻomaʻamaʻa ʻana i ka ʻili he wela wela, e hahai i ka AASHTO M232 a me ka maʻamau like e like me AASHTO M111, EN1461 etc.
Hoʻopaʻa ʻia ka hopena hope ma ka hoʻomaka a me ka hopena o ke alanui.Hiki iā ia ke pale aku i ka poʻe me ka pā kila bend, e hoʻohaʻahaʻa i ka ʻeha mai ka guardrail.