... ) High Quality :grade 10.9, and 12.9 2) Finishing:Bake Paint ,zinc plated, phosphate,black oxide u bolts,u bolts ... steel, (45#)ASTM 1045 steel,(40CR)ASTM 5140 steel3) Finishing: Bake Paint, Black Oxide , Zinc Plated, Phosphate, Electrophoresis,Dacromet,ect.4 ...