A worldwide-accepted technique to protect steel lattice girders with welded hollow sections against corrosion is the hot-dip galvanizing process. In this process. vent holes are required in braces to fill the inner part protecting them from corrosion. to allow the immersion of the structure in the zinc bath and to recover the excess fluid after the bath. https://www.roneverhart.com/100-Percent-Sunglasses-SPEEDCRAFT-LE-Money-Mike-HiPER-Silver-Mirror/