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Suitable For: Suitable for most Chinese imported Pit / Dirt bikes with 420 sprockets. 420 Drive Chain: This is a 420 chain with a length of 121.5cm, please make sure it fits before purchasing. Model: 443869. Inner length: 121.5cm / 48". Solid Metal Structure: Solid metal structure, high toughness and tensile strength, firm chain connection, not easy to break. Drive Chain Replacement: High transmission efficiency, low fuel consumption. Please check as much as possible to make sure the item is what you need. Easy To Install: Easy to repair and maintenance. No instructions included. Professional installation is highly recommended!