... -quality carbon steel.Quality and price is our vantage. glass curtain wall spider Casting: investment casting ,precision casting, lost wax casting ,soluble ... ,EN, ASTM, BS,JCSI.Piece numbers: small, medium and large series.Process: cast, machining, turning, milling, drilling, thread cutting.Surface treatment ... -ray,metallograph.Quality control: According to ISO 9001 2001 glass curtain wall spider