... We are a leading professional manufacturer of straight seam welded steel pipes before. On this basis, we began to deal ... in August, 2008. Our main products are all kinds of steel pipes used in construction, Scaffolding systems, scaffolding couplers, frame systems, ... system, cuplock system. 2) Scaffold couplers: drop forged, and steel pressed clamps.3) Frame scaffolding: plattec, mansion, other frames.4 ...