Notice : 420 20mm 10T 11T 12T and 420 17mm 10T 11T will haven't Screw HolesDescriptionThe 420 front engine sprocket will be fit for the dirt bike,monkey bike ATV,go kart and so on.If the diameter of the center hole is 17mm,the distance between two holes will be 30mm.If the diameter of the center hole is 20mm,the distance between two holes will be 34mm.Package Included:1pcs 420 Sprocket With Retainer Plate LockerSPECS:Please compare the specs to make sure this item will fit your application BEFORE placing an order !!Fresh Stock ,Fast Ship. Silver or Black Screw Send Randomly