... screw or Connecting screw1.Head type:Flat Pozi ,Flat Hex Socket2.Standard: ANSI, ISO, DIN, BS, JIS, ... 4.Surface: Zinc plated(yellow, black, green), black oxide, nickel plated, chrome plated, Cr+3, hot dip galvanized, brass plated.Sizes: Hex socket: 1) ... Steel/Stainless Steel/Brass ,According your requestSurfacePhos,Zinc,Yellow Zinc,Dacromet,Ruspert,Brass or Black Oxide availablePackingSmall box ...