... ,10.9,12.9 3:Material:mild steel,45# steel,40Cr,42CrMo high strength hex bolt, hex cap bolt, balck bolt1. Surface:black oxide, phosphated,galvanized ... , 8.8, 10.9, 12.9 3. Material: mild steel, 45# steel, 40Cr, 42CrMo4. Packing: standard neutral carton box fastened with palltet5 ... (2) Strict quality control(3) very reasonable and competitive price high strength black bolt