Feature: 1. Applications: Engineered with 12x17mm inner diameter and a 9 tooth design, the sprocket can only be used with 420 chain, delivers stable performance and high reliability. 2. Steel Material: The 420 9T front sprocket is crafted from premium steel, ensuring high toughness, excellent wear proof performance, and long term durability. 3. Stable Performance: Whether you are venturing into rough terrains or exploring new adventures, this motor sprocket is built to endure challenges and maintain unwavering stability. 4. 6PCS: Each package contains 6 front sprockets, providing an effective solution for replacing old or bad sprockets. It is designed to meet your regular replacement needs in mind. 5. Replacement Accessory: With its steady performance, the 420 chain sprocket is an excellent accessory, allowing your device to always maintain the best performance. Specification: Item Type: Front Sprocket Material: Steel Inner Diameter: Approx. 12x17mm/0.47x0.67in Package List: 6 x Front Sprocket