Usage Tips:Description: Quality Material: Crafted from premium steel, this sprocket brake hub offers exceptional strength and durability, ensuring long term performance for your go-kart Fitment: Designed to fit 212cc, GX160, GX200, and 196cc engines with 6.5HP, this hub is fit for dune buggies, drift trikes, and heavy-duty go-karts Easy Installation: The hub features a 1in bore with a 1/4in keyway for straightforward alignment and secure attachment of the sprocket to the axle shaft using set screws Optimal Dimensions: With a width of 102mm and a bore size of 1 inch, this hub ensures compatibility with various kart parts while maintaining balance during working Complete Package:Package includes 1x sprocket hub, 1x keyway, 4x bolts, 4x nuts, 2x set screws, ready for installation on your vehicle's axle system to enhance performance and reliability on the track or off-road adventures Specification: Material:Steel Size Chart: Sprocket Hub:Total Width 10.2cm/4.02inch, Bore:2.54cm/1.00inch Keyway: Width 0.635cm/0.25inch Package Includes: 1 Sprocket Brake Hub Set Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.