we are professional manufacturer 1.material grade:AISI 201,Y201Cu,202 AISI 303, 304, 304L,310,310S,316 ... surface--pickling into acid liquid--polished by automatically machine--cutting into pieces--checking quality--package4.surface:black,pickling,polish,drawn bench ... square bar is widely used in chemical, shipping,architecture,machine-made, household products industry ,etc., stainless steel square bar ...