1) Material: 304(L),316(L), 321, 310, 430, 201,202 2) Certificates : ISO, TUVRheinland 3) Speciafication as per customer ... ,GB,JIS,ASTM,DIN etc.3) Grade: 200,300,400series, 201,202,301,304,304L,309,310,316,316L,410,420 ... , I will be pleasure to answer you .Pictures Show factory direct 201,304,316 stainless steel channel