This is a A-OL40D 40 Double Offset Link (Drives) PN: OL40DMain Description As Following : A-OL40D 40 Double Offset Link (USA) P.N: OL40D A-OL40D 40 Double Offset Link (USA) P.N: OL40D Crossed From: 2221-42821 JOHN DAY , 803-420400 , , 803420400 , 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