This is a A-OL80M Metric Offset Link w/ Cotter Pin PN: OL80MMain Description As Following : A-OL80M Metric Offset Link w/ Cotter Pin P.N: OL80M Used W/ RCKE11702 Metric Roller ChainPitch: 1" / 25.4 MMWidth: 17.02 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/ RCKE11702 Metric Roller Chain Pitch: 1" / 25.4 MM Width: 17.02 MM