Specification: Item type: Electric Scooter Chain Material: iron Color: As picture shown Scope of application: Scooter Optional type: 25H chain, T8F chain, 420 type chain, 428 type chain Model: T8F chain Number of sections: 120 sections Inner diameter: Approx. 4mm/0.16in Adaptation: 54 tooth sprocket Model: 25H chain Number of sections: 114 sections Circumference: Approx. 86cm/33.9in Inner diameter: Approx. 3mm/0.1in Model: 420 type chain Section Pitch: Approx. 12.7mm/0.5in Number of sections: 70 sections Circumference: Approx. 889mm/35in Inner diameter: Approx. 6mm/0.2in Model: 428 type chain double-row chain Number of sections: 102 sections Inner diameter: Approx. 7.5mm/0.3in Package List: 1 x 25H chain or 1 x T8F chain or 1 x 420 type chain or 1 x 428 type chain Perfect Replacement: The chain is a great replacement for the old or broken one. The worn chain does not move smoothly and the sprocket wears faster. So you can choose to change a new chain. Fine Workmanship: The chain sprocket has fine workmanship, it is easy to replace old or damage chain. It can meet your need about riding. Convenient to Use: All chains are strong and durable, long service life. This product is easy to use, convenient and practical. Its installation does not need some complicated tools. Wide Applications: The bike chain is suitable for electro‑tricycle, electric scooter, electric bicycle. So you can choose the right chain according to your bike. It will bring a better experience for you. 4 Different Types: 4 different types about chain for you to choose, 25H chain, T8F chain, 420 type chain and Type 428 chain.This product can meet your different needs.