1.  QUALITY: Grade 8.8, 10.9, 12.9 .2.  SURFACE PROTECTION: Black oxide with Protective Oil, Phosphate (Grey),                                            Zinc Coating (Yellow/Silver) and Dacromet (Sliver).3.  MATERIAL: 45#, 40Cr, 35Crmo (SAE1045, SAE5140, SAE4135) .

wheel bolt and nut