A, Britain standard ordinary mild steel link chain ( short, medium, long link chain)
B, German standard DIN series (DIN5685, DIN763, DIN764, DIN766)
C, Korean standard link chain
D, Plough chain, animal chain, hanging chain, snow chain and other agriculture hardware and tools.
E:G30,G43,G70,G80,G100 
Usage:nets down, home decoration,garden decoration,lifting,anchor,public protection,mine,anti-skid, lock chain,etc