Product features: 12 teeth Material so selected to ensure adequate strength and wear resistance Tooth surfaces are heat treated so as to achieve high hardness level How to put it in a vehicle? Bore into sprocket according to design value Provide key way as per required size Assemble sprocket using key, make sure do not hit sprocket directly on shaft, use wood as an interface to hit on sprocket Tight groove bolt into hub of sprocket with default hole size.