Raws li ib qho ntawm feem kev sib tw dai ntawm lub tuam txhab, peb cov hlau riser clamps yog UL pom zoo. Thiab lawv tau txais lub npe nrov nrov thoob ntiaj teb, tshwj xeeb tshaj yog nyob hauv North America, South America, thiab Middle East. Thiab lawv tuaj yeem raug kho raws li koj qhov yuav tsum tau ua, piv txwv li, lawv tuaj yeem tsim nrog roj hmab, ntxig lossis ntaub thaiv. Kuj, muaj ntau yam kev kho saum npoo rau koj cov kev xaiv: Pre-galvanized, Zinc plated, epoxy thiab Green galvanized tiav kom tau raws koj cov qib sib txawv ntawm cov kev xav tau.