Cov khoom siv caij nplooj ntoo hlav: carbon hlau, tooj dag, etc, ittm plated, kub-molt galvanized, kub oxide, dawb, thiab lwm yam.
Cov Khoom Siv Cov Hlau, Alloy Hlau, Hlau Stainless, Txhuas, Brass, Tiaj, Iso, GB, Tsis Muaj Koj Tus Kheej), thiab lwm yam. Nto tiav dub, zinc plating, tooj plating, tshuab tooj liab, kub dipped galvanized, daromet thiab lwm yam yuav tsum tau txais lub sijhawm tus neeg siv khoom hauv 30 hnub tom qab tau txais koj cov nyiaj tso cia. Pob los ntawm cov hnab roj carbon lossis phom tua ces ntawm cov khoom lag luam ntoo los yog cov neeg siv khoom lag luam cov neeg siv khoom lag luam: 24-teev kev mloog koj cov lus qhia lossis kev xav tau thiab tawm tswv yim asap.