Features1The worn chain does not move smoothly and the sprocket wears faster. 2Fine workmanship, easy to replace old or damage chain. 3All chains are strong and durable, long life. 4Easy to use, convenient and practical. 5Suitable for electrotricycle, electric scooter, electric bicycle. 64 different types for you to choose, meet your different needs.SpecificationItem type:ElectricScooterChainMaterial: ironColor: As picture shownScope of application: ScooterOptional type: 25H chain, T8F chain, 420 type chain, 428 type chainModel: T8F chainNumber of sections: 120 sectionsInner diameter: Approx. 4mm/0.16inAdaptation: 54 tooth sprocketModel: 25H chainNumber of sections: 114 sectionsCircumference: Approx. 86cm/33.9inInner diameter: Approx. 3mm/0.1inModel: 420 type chainSection Pitch: Approx. 12.7mm/0.5inNumber of sections: 70 sectionsCircumference: Approx. 889mm/35inInner diameter: Approx. 6mm/0.2inModel: 428 type chain double-row chainNumber of sections: 102 sectionsInner diameter: Approx. 7.5mm/0.3inPackage List1 x 420 type chain