... AS1576 4.48.3mm*48.3mm Scaffold Tube External Joiners Item Scaffold Tube External JoinersMaterialQ235Q255Q345Surface TreatmentHDG,Galvanized, ... .2.Main product: Scaffolding System( Kwikstage, Cuplock, Ringlock, Haki); Scaffold Coupler( British Type, American Type, German ... Indian Type etc.); Shoring Props,Formworks, Frame System, Scaffold Steel Tubes, Accessories, Steel / Aluminum Planks etc. ...