1.Stainless Steel Blind Base,Marine Hardware 2.Tuopu metal manufacturing-china investment casting 3. ... ,soluble glass process complex shell process.2. Materials: stainless steel ,carbon steel ,alloy steel, heat resistant steel ,tool steel ,brass and aluminum ,according to DIN ,EN ... -ray,metallograph.7. Quality control: According to ISO 9001 2001 Stainless Steel Blind Base,Marine Hardware