... ,45#, 65mn. Brass/Copper Surface Treatment:Plain/Polished, H.D.G,black,zinc Products: Square Washer Materials: 304/316(A2ora4) Stainless Steel ... /W/ DIN125a\125b\DIN9021\DIN433\434\DIN440\DIN7989 Surface Treatment: Plain/Polished, Galvanized Zinc (Blue, Yellow, White), H. D. G, Black ...