Specifications: 1)Size : M6-M12 2)Material: Carbon Steel and Alloy Steel 3)Finish: Black Oxide, Coating Zinc Specifications:bolt1)Size : M6-M122)Material: Carbon Steel and Alloy Steel3)Plating: Black Oxide,Zinc, Chrome, Galvanized,Nickle, Dacromet, Delta-Tone, Geomet,Ruspert 4)Grade: 4.8; 8.8; 10.9;12.9 Large Round Head Screw