1) Material: 304(L),316(L), 321, 310, 430, 201,202 2) Certificates : ISO, TUVRheinland ... ) Grade: 200,300,400series, 201,202,301,304,304L,309,310,316,316L,410,420,430,etc. 4) Size: According to client's ... be pleasure to answer you .Pictures Show factory direct 201,304,316 stainless steel channel