... standard:ISO/ANSI/DIN color:nature,black,yellow,blue 520 high quality motorcycle chain,suit for all kinds of motorcycles 1)material:40mn ... /45mn2)color : nature,black,blue,yellow3)advanced heat treatment process, mesh belt conveyor furnace use,chain dry machine4)standard:ISO/ DIN ... .5mm pitches),B series (9.525-50.8mm pitches)2)motorcycle chains :415,415H,420,420H,428,428H,520,520H,6303 ...