... black,phosphated,galvanized.. 2.Grade:4.8,8.8,10.9,12.9 3:Material:mild steel,45# steel,40Cr,42CrMo high ... strength hex bolt, hex cap bolt, balck bolt1. Surface:black oxide, phosphated ... standard neutral carton box fastened with palltet5. Quality certificate:6. Supply ability: 1000 tons per ... (2) Strict quality control(3) very reasonable and competitive price high strength black bolt