Alapiʻi kila
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Nā mea pono hana kila ʻAmelika ASTM A572 Steel Stairpair
ʻAnuʻu kila ASTM A572he alapiʻi ikaika, paʻa e hoʻohana ʻia no nā hana ʻoihana, kalepa a i ʻole nā kumu hana.
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Nā mea pono hana kila ʻAmelika ASTM A992 Steel Stairpair
ʻAlanui kila ASTM A992he mau alapiʻi kila ikaika kiʻekiʻe a paʻa i hoʻolālā ʻia no nā noi ʻoihana, kalepa, a me nā pono hana.