Mechanical and physical properties : Grade 5 / Grade 8 / Grade 10 Finish : Coating Zinc/ Black oxide /Phosphate / Dacromat Machanical and physical : Grade 5 / 8 / 10 8.8 10.9 12.9Material : 45#, 40Cr, 35Crmo (SAE1045, SAE5140, SAE4135)Finish : Coating Zinc ( White , black , yellow , green ) , Black Oxide , Phosphate Dacromet wheel bolt