... Casting: investment casting ,precision casting, lost wax casting ,soluble glass process complex shell process.Materials: stainless steel ,carbon steel ... cast, machining, turning, milling, drilling, thread cutting.Surface treatment: glass rays electrolytic polishing, coating, varnishing, bromzing. Passivating, grinding, polishingAnalysis ... According to ISO 9001 2001 stainless steel spiders,glass spider