Wheel Bolt for BPW trailer. 1. Grade 8.8/10.9/12.9; 2. M22xM22xL111; 3. Black/Grey Color, Yellow/Silver Zinc Coating. DEXIN--Expert of High-strength Wheel Bolt Item Model Wheel Bolt for BPW trailerItem No. DXE069Grade 8.8, 10.9, 12.9Material 45#, 40Cr, 35CrMo (SAE1045, 5140, 4135)Color Black Oxide, Grey hosphate, Yellow/Silver Zinc Coating, DacrometQuality of Grade 10.9 Bolt Hardness: HRC34-38, ...