This is a A-OL50M Metric Offset Link w/ Cotter Pin PN: OL50MMain Description As Following : A-OL50M Metric Offset Link w/ Cotter Pin P.N: OL50M Used W/ RCKE5838 Metric Roller ChainPitch: 5/8" / 15.875 MMWidth: 3/8" / 9.65 MM Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Metric Roller Chains and Attachment Links, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Used W/ RCKE5838 Metric Roller Chain Pitch: 5/8" / 15.875 MM Width: 3/8" / 9.65 MM