... material:40mn/45mn standard:ISO/ANSI/DIN 428H high quality motorcycle chain,suit for all kinds of motorcycles as Yamaha,suzuki1)material:40mn/45mn2 ... -63.5mm pitches),B series (9.525-50.8mm pitches)2)motorcycle chains :415,415H,420,420H,428,428H,520,520H ... roller chain attachments:A-1,A-2.K-1,K-2,K-3,SA-1,SA-2,SK-A,SK-24)double pitch ...