Feature: 1. Applicable Model: The 420 chain 24T rear sprocket is applicable for Z50A Z50 Z50R Z50J Monkey Bike, please confirm whether your model is applicable before buying. 2. Function: The rear drive sprocket is an important part of the transmission system, which makes the chain drive more stable and more efficient. Give you a more comfortable riding experience. 3. Durable and Lightweight: Sprocket is made of steel alloy, strong and durable, with strong toughness and long service life. Simple design, compact, easy to carry and use, convenient and practical. 4. Size: Rear sprocket has 24 gears, sprocket diameter is 102mm, inner diameter is 30mm, thickness is 6mm. 3 mounting holes are 9mm in diameter. 5. Easy to Install and Remove: The rear sprocket adopts reasonable design, easy to install and remove, convenient and practical, can replace the old or damaged. Specification: Item Type: 420 Chain 24T Rear Sprocket Material: Steel alloy Sprocket Fixing Hole Diameter: Approx. 9mm / 0.4in (3 bolts fixed on rear hub) Sprocket Diameter: Approx. 102mm / 4in Sprocket Inner Diameter: Approx. 30mm / 1.2in Sprocket Thickness: Approx. 6mm / 0.2in Number of Gears: 24T Application: New state of rear sprocket, premium steel alloy forging, perfect after market replacement parts, can be used for the replacement of the original sprocket renovation maintenance and other applications, better transmission performance and riding experience Fitment: For Z50A Z50 Z50R Z50J Monkey Bike. Package List: 1 x 420 Chain 24T Rear Sprocket