This is a A-176278C1 Sprocket, Gathering Chain Drive PN: 176278C1Main Description As Following : A-176278C1 Sprocket, Gathering Chain Drive P.N: 176278C1 includes: (1) 454894R1 roll pin & (1) 17098 roll pin not illustratedDim A (1): 10 toothDim B (2): 1.00" bore Replaces: SP145 *** NO CLASS *** , SP145H *** NO CLASS *** , Crossed From: AV101139 VAPORMATIC , CS176278 SHOUP , 118034 , Found in Section & Models : Headers/Platforms/Feeder House > Corn Head Parts, Case-IH HEAD, CORN: 824, Case-IH HEAD, CORN: 833, Case-IH HEAD, CORN: 834, Case-IH HEAD, CORN: 844, Case-IH HEAD, CORN: 853, Case-IH HEAD, CORN: 854, Case-IH HEAD, CORN: 863, Case-IH HEAD, CORN: 864, Case-IH HEAD, CORN: 873, Case-IH HEAD, CORN: 874, Case-IH HEAD, CORN: 883 Associated Items : New Also This is An Aftermarket Product And : Bore: 1.00" Includes: (1) 454894R1 Roll Pin (not illustrated) Teeth: 10