... Hex Socket2.Standard: ANSI, ISO, DIN, BS, JIS, AS 3.Material: Low carbon steel(C1008, C1010, C1012, C1015, C1018, C1022), 4.Surface: Zinc plated ... (yellow, black, green), black oxide, nickel plated, chrome plated, Cr+3, hot dip galvanized, brass plated.Sizes: Hex socket ... Stainless Steel/Brass ,According your requestSurfacePhos,Zinc,Yellow Zinc,Dacromet,Ruspert,Brass or Black Oxide ...