New starter roll drive sprocket. Sprocket has 20 teeth and 1.504″ hex bore diameter. Used on 60 chain. Fits round balers. Dim A (1) 20 Tooth Dim B (2) 60 Chain Dim C (3) Bore Size: 1.504″ ROUND BALER: 330 ROUND BALER: 335 ROUND BALER: 375 ROUND BALER: 385 ROUND BALER: 430 ROUND BALER: 435 ROUND BALER: 530 ROUND BALER: 535 ROUND BALER: 540 ROUND BALER: 545 ROUND BALER: 550