1)Stud 2)Material: Carbon steel, B7, 42CrMo 3)Surface: Plain, Black, HDG, Dacromet, etc 4)Reliable quality compatitive price We ... have nearly 40 years experience in producing high strength fasteners, our products be widely ... may be made according to the buyer's requirements.3) Material: Carbon steel, B7, 42CrMo, etc4) Standard: DIN, ANSI, BS, ...