... There are all kinds of wire drawings, twisting equipmets and morden assembly line can enable pre-tension, heat treatment hot-dip galvanizing ... such as GB8919, GB/T20118, GB/T20067 and also international standards ISO, ASTM, EN, JIS and API etc. Got API, DNV, LR ... , BV, CCS, MA and KA certification,which assure good quality ...