Steel C Beams: 1)height:80-300mm 2)width:40-70mm ... specification and size can be customized. Cool-rolling C-steel purlin, though its small cross section, accords with fixed ... and high-efficient and can replace angle steel purlin, groove purlin, and steel bar, etc.steel purlin 1, Standard: 41x41, 41X21 2 ... : 3m, 5.8m, 6m 4, Treatment: HDG, PG steel purlin 1, Standard: 41x41, 41X21 2, Wall thickness:1.5mm ...