... 4135),42CrMo. 5.Surface Protection: Black oxide,Protective oil,Phosphated,Zinc plated,Dacromet, Bake painting,Polishing. 6.Colors: Black,grey,golden,silver ... : 32°To 38° Our Advantage 1.Super Quality: Advanced and perfect testing facilities to ensure high quality and reliable products. 2.Competitive Price: Direct manufacturer ...