... .Factory direct selling 5.DIN6330 stainless steel 304 heavy hex nut 1.Nut:M3-M64.2.Materials option: Stainless Steel C276, 904L, 304, 304L, 310S ... , 316, 316L, 321, 317L, 2507, 2205, 254SMO, AL6XN, 1. 4501, 1. 4529.Super duplex stainless steel F55, F51, F53 HastelloyB & C, Inconel, Incoloy etc ...