28B B Series Roller Chain 1.material:40MN/A3 2.pitch ... .5/6.0mm 4.surface treatment:heat treatment 28B B Series Roller Chain1.material:40MN/A32.Standard Chain3.color: ... logoMain products as the following: 1.Motorcycle Chains: 25H (04CH), 415, 415H, 420, 420H, 428, 428H, 520, 520H, 530, 530H, ... : 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6,SC8,SC105. ...