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