Igwe anaghị agba nchara na-ezo aka na nchara 12-300 mm n'obosara yana 3-60 mm gbara ọkpụrụkpụ nwere akụkụ akụkụ akụkụ anọ na ọnụ ntakịrị ntakịrị.Ewepụghị ígwè nwere ike okokụre ígwè, nwekwara ike-eji dị ka welded anwụrụ oghere na mkpa slab maka laminated mpempe akwụkwọ.Ọkpụrụkpụ bụ 8 ~ 50mm, obosara bụ 150-625mm, ogologo bụ 5-15m, na ngwaahịa nkọwa span bụ ok, nke nwere ike izute mkpa nke ọrụ.Kama efere ọkara, ọ nwere ike ịgbanye ya ozugbo na-enweghị ịkpụ.