WORKS WITH SPLIT SPROCKETS ONLY! Sprocket and axle not included. High Performance Split Sprocket Hub for your Go Kart or Mini Bike. 1 1/4 Inch Bore. Billet Aluminum Sprocket Hub Bolt Circle: 5 1/4" Threaded Bolt Holes 1/4-28. For Black in Color Search ASIN B0CJKNPPW1 Hardware Included.