Cov khoom siv: carbon hlau
Qeb: 4/8/10/12
Kev kho deg: cov xim ntuj, dub oxide, electro-galvanized, kub-dip galvanized, dacromet, thiab lwm yam.
Txuj: GB, DIN, ISO, thiab lwm yam.
Xov hom: tag nrho cov xov, ib nrab xov
