I-Black Iron Square Tube impahla iyibhande lensimbi eligoqiwe elibandayo elinodonga oluyi-0.6mm ukuya ku-2.0mm.Uma ibhande lensimbi eligoqiwe elibandayo lishiselwa kuzinga lokushisa lokudonsa, umbala ongaphezulu uzoba mnyama ngenxa yokuxhumana nezinga lokushisa eliphezulu nomoya.Futhi ebizwa ngokuthi ishubhu lesikwele eligoqiwe elimnyama eligoqiwe elisetshenziswa kabanzi ekwakheni insimbi.