... we are professional manufacturer 1.material grade:AISI 201,Y201Cu,202 AISI 303, 304, 304L,310,310S,316,316L,317,321 AISI 410,420,430 ... checking quality--package4.surface:black,pickling,polish,drawn bench,milling, etc .,5.common sizes we have large stocks,diameter from ... used in chemical, shipping,architecture,machine-made, household products industry ,etc., stainless steel square bar 201,202,304,316