wheel bolt 1.material:mild steel,45#steel,40Cr 2.surface:zinc plated,black oxide,phosphated 3.size:M12-M32 4.grade:8.8,10.9 wheel bolt, high strength wheel hub bolt, wheel bolt, tyre bolt Certificate: ISO9001:2000High quality strengthen: Grade 8.8, 10.9, 12.9Material: mild steel, 45# steel, 40Cr steel, 35 Cr Mo steelThread pitch: 1.5mm, 2.0mm, 3.0mmSupply ability: 500 metric tons per ...