... ,Folding grapnel anchor. 2.According to ISO 9001 2001 Stainless Steel Folding Anchor,stainless steel wedge anchor1. Casting: investment casting ... shell process.2. Materials: stainless steel ,carbon steel ,alloy steel, heat resistant steel ,tool steel ,brass and aluminum ,according to ... ,metallograph.7. Quality control: According to ISO 9001 2001 Stainless Steel Folding Anchor,Galvanized steel anchor