HOBBYIN 5 Pack Heavy Duty Roller Chain Connecting Links,Bike Chain Link Bicycle Chain Lock Connector Single Speed Master Link Joint PartsType: Bike Chain LockMaterial: SteelColor:BlackSize:20.9MM*10.2MMQuantity: 5PcsFeature: Durable, Easy to Use, Bike AccessoriesSuitable for BMX bike, track bike, urban bike and so on.Made from high quality steel ma..