This is a A-CA555O CA555-O Offset Link PN: CA555OMain Description As Following : A-CA555O CA555-O Offset Link P.N: CA555O A-CA555O CA555-O Offset Link P.N: CA555O Crossed From: CA555HL , Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Roller Chains and Attachment Links, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : High Quality Afternaket Shipped from Both US and Canada