Q345B cold drawn square pipe has good stability and is a composite structure. Ko te waenganui o te kakahu o te epoki i whakaungia ai te putorino parahi.Ko te hononga o tenei hanga e tukua ana e te pūpa tērau kia pai rawa te uEhara i te mea he mahara kau te pipa ki te kopere i te kanohi o aua mea koreotive, engari i te mea e taea ana e ia te whakanekehanga i te mea e taea ana e ia te whakanekehanga, koia te pipa karere matao e kore e taea e ia te hanga i muri i te mahi, a ka taea e ia te whakanekehia te ora o te pūpa
