Features1LIGHTWEIGHT AND DURABLE: The sprockets are made of carbon steel, lightweight and durable, able to withstand high pressure and heavy loads. 2TYPE: This set contains a 428 10T 20mm sprocket and a 9T 12X17mm H hole sprocket. this design of gears can provide reliable transmission and smooth performance. 3EASY TO INSTALL: Small size and light weight make installation very easy. Only simple tools and operations are needed to complete the installation, no skills are required. 4APPLICABLE SCENARIO: It is suitable for common engine, and can be widely used in the transmission system of mechanical equipment, vehicles and other fields. 5IMPROVE WORKING EFFICIENCY: Replacing the old damaged parts with new ones can improve the efficiency and performance of the machine and prolong the life of the equipment.SpecificationItem Type: Sprocket Material: Carbon SteelWeight: Approx. 81g / 2.9ozPackage List2 xSprocket