... steelBracecross support, angle brace, brace between purlin/column/beamBoltanchor,ordinary,high strenght boltRoof &Wallsandwich panel or steel color ... : 1) Metal structure series, such as Portal Steel Frame, Tower construction, Steel roof truss 2) Chain structures series, such as ... of cable rollers 4) The production and distribution of welding steel flasks for casting 5) The designing and production ...