Features1Smooth and Efficient Operation: The 8 tooth 420 chain sprocket ensures smooth and efficient motor sprocket conversion, enhancing the overall performance of your motor. 2Durable Carbon Steel Material: Made from carbon steel, this 420 8 teeth motor sprocket is highly durable and can withstand long term use, providing reliable performance. 3Optimal Thickness: With a thickness of approximately 5mm, this 8 tooth 420 chain sprocket is designed to provide optimal strength and stability, ensuring reliable operation. 4 Fit: The inner dimension of this 8 tooth 420 chain sprocket is approximately 17 x 12mm, making it suitable for H type shaft gears of 120W and 100W small motors. 5Versatile Applicability: This 8 tooth 420 sprocket is compatible with a wide range of small motors, making it suitable for various applications such as bicycles and other machinery.SpecificationItem Type: 8 Tooth 420 Chain SprocketMaterial: Carbon SteelWeight: Approx. 105g / 3.7lbThickness: Approx. 5mm / 0.20inInner Size: Approx. 17 x 12mm / 0.67 x 0.47inPackage List5 xSprocket