Description Stainless Steel Round / Flat / Square / Angle / Hexagon Bar: 1) Material: 304, 304L, 316L, 321, 310S, 410, 410S, 420, 420J1, 430, 201, 202 2) Diameter: 6mm - 400mm 3) Surface finish: Polished bright, glossy smooth, black 4) Applications: Construction field, ships building industry, car making industry, petroleum & chemical