Socket Set Screws Alloy ,Allen Screws,Flat Socket Cap Screw Alloy, Button Socket Cap Screws Alloy,Socket Head Cap Screws Alloy ,Socket Shoulder Screw Alloy ,UNC,UNF,BSW,DIN912,DIN7991, Grade5,8,Class8.8,10.9,Stainless Steel304,316,316L Surface:Plain,Zinc , Black,Black Zinc,Yellow Zinc,Hot Dip Galvanized,Mechanical Galvanized