Description Fitment: This is very popular for use on Gocarts and Mini bikes. This kit will work for 40/41/420 chains. Package include: 1*5/8'''' by 12'''' Jackshaft 3/16'''' Keyway 1*8 Tooth Sprocket with built in Key, 5/8'''' ID 1*14 Tooth Sprocket, 5/8'''' ID 2*Bearing hangers 2*Sealed Precision Bearings 2*Collar 5/8'''' ID 1*key, 3/16'''' by 3/16'''' by 3/4'''' 6*screws The measurement of the actual items may slightly different from the listing images due to manual measurement please allow 0.51mm difference. Thanks for your understanding. 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.''