Umsebe wensimbi i, kungakhathaliseki ukuthi uvamile noma ulula, unosayizi wesigaba esiphambeneyo ophakeme futhi omncane, ngakho-ke isikhathi sokungagxili kwama-axes amabili amakhulu esigaba esiphambeneyo sihlukile kakhulu, ngakho-ke singasetshenziswa ngqo kuphela kumalungu agobile endizeni yepuleti lawo lewebhu noma akhiwe ngamalungu aboshwe nge-lattice. Akufanele amalungu okucindezela kwe-axial noma amalungu agobile endizeni aqonde kuwebhu, okunciphisa ukusetshenziswa kwawo.
I-steel i beam i ihlukaniswe kakhulu ibe yi-steel i beam evamile, i-steel i beam elula kanye ne-flange wide steel i beam. I-steel i beam enama-flange abanzi, ama-flange aphakathi kanye nama-flange amancane ahlukaniswe ngokwesilinganiso sokuphakama kwama-flange kuma-webs. Imininingwane yalawa amabili okuqala ingu-10-60, okungukuthi, ukuphakama okuhambisanayo kungu-10 cm—60 cm. Ekuphakameni okufanayo, i-steel i beam elula ine-flange encane, i-web encane kanye nesisindo esincane. I-steel i beam ene-flange ebanzi, eyaziwa nangokuthi i-steel H beam, ibonakala ngemilenze ehambisanayo futhi ayikho i-intensive ngaphakathi kwemilenze. Ingeyensimbi yesigaba sezomnotho futhi igoqwa kumshini wokugoqa obanzi ophakeme kane, ngakho-ke ibizwa nangokuthi "i-universal steel i beam".