Complete 3/4" X 10" Jackshaft kit will work for 40/41/420 chains. This is very popular for use on Go Karts and Mini Bikes. Package Include: 1 * 3/4" by 10" Jackshaft + 2 * 3/4" UCP204-12 Mounted Pillow Block Bearings + 2 * 3/4” Bore Shaft Collars + 1 * 14 Tooth 3/4" ID Sprocket + 1 * 10 Tooth 3/4" ID Sprocket with built in Key + 1 * 3/16" Keyway + 4 * screws Note: We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need.