... :ZULIN TRADEModel Number:ZTA-09Certification:ISO9001-2008Material:Steel Q195, Q215 ,Q235, Q345 ,Q195-Q235Dimension:Φ48 steel tube, Φ48x48 Φ60x48 couplerSurface Treatment:Cold galvanizedApplication ... after depositPayment Terms:T/T L/CSupply Ability:2tons/day Steel Tube & Coupler Project Application