Heat treatment
High frequency quenching,carburization
surface treatment
galvanization,plating,dull polish, sand blasting etc
Advantage
rust-proofing,long life time
trip distance
20000-25000km
Technology
hobbing,stamping,forging
Colour
black,slivery,zinc,natural colour
Packing
blister card ,bubble bag,colour box or as your requirment