U25/U29/U36 Steel Arch Support for Mining 1.We are manufacturer 2.It is ... U36 steel 3.ISO, SGS Certification U25/U29/U36 Steel Arch Support for Mining U type steel support main purpose: for ... .U25,U29,U36 type steel frame.U25/U29/U36 Steel Arch Support for Mining:1.Spec.: 25U, 29U, 36U 2. ... easy to deformation ,etc Regarding the accessories :1,U steel arch clamp for 25U,29U,36U steel 2, spreader bar : to ...