Black Iron Square Tube rauemi he matao hurihia waro maitai here ki te matotoru taiepa 0.6mm ki 2.0mm.I te wa e wera ai te whitiki rino-matao ki te pāmahana whakahiato, ka mangu te tae o te mata na te nui o te paanga ki te hau.I whakaingoatia ano he ngongo tapawha kua oti te whakamaroke i te matao e whakamahia ana mo te hanganga maitai.