you can choose materials between 200,201,202,304,316(A2,A4),304L,316L,B8,B8M etc. Our mostly products include stainless ... ,you can choose materials between 200,201,202,304,316(A2,A4),304L,316L,B8,B8M etc.such as all spec.threaded ... ,traffic product,and environment engineering. stainless steel DN7982 CSK TAPPING SCREWS