... ASTM A240,GB/T3270,JIS4304,EN10088-2,etcSurface treatment:No.1,No.4,2B,BA,Hairline,mirror finish,etc. 2B:The ... ,have better brightness with discontinuous coarsestria,but thinner than No.3, are used as bathtub building inner and external ornaments electrical ... ,have better brightness with discontinuous coarsestria,but thinner than No.3, are used as bathtub building inner and external ornaments electrical ...