1.Steel Kem, Beam: Kuv beams nrog kub dip galvanization
2. Cov khoom siv nqaij qaib: cov khoom noj tseem ceeb, lub tawb thiab cov ncej, cov kab noj, haus dej, tsis siv neeg quav tshuaj ntxuav, qe sau, qhov cua, tswj ib puag ncig thiab teeb pom kev zoo
