100BS25 Sprocket With 2-15/16" Finished Bore 12-Tooth Sprocket This 100BS13 sprocket features a

This 100BS13 sprocket features a 1-15/16" finished bore with a key-way and two set screws

Keyway Size: 3/4" X 3/8"

06B11H sprockets with a stock bore comes with the standard 8 millimeter inside diameter hole with no key-way or set screws and can be easily machine bored to custom sizes

This 100A8 sprocket is a durable

100BS25 Sprocket With 2-15/16" Finished Bore 12-Tooth Sprocket This 100BS13 sprocket features aThis 100BS25 sprocket features a 2 15 16" finished bore with a key way and two set screws. It is a durable, high quality, and precision sprocket with 25 hardened teeth. Sprockets that have hardened teeth last longer and are much more durable than those that don't. Something else that is notable about this 100BS25 sprocket is that it fully meets all ANSI Standards, which insures proper contact between the #100 roller chain and sprocket thus preventing