... :We supply any suitable Steel Structures, Net Assemblies,Dome Truss,Curtain Walls for all kinds of buildings.We offer design, drawing ... double span, long spanHeight:With customer's requirementComponentsBolt ball:Steel 45#, epoxy zinc primer with PU paintColumn:Q235, Q345 ... primer with PU paintHigh strength bolt:Cr 40, electroplatingSleeve:Steel Q235 & 45#, electroplatingPurlins:Q235 C channel or Z ...