08B23 Sprocket With Stock Bore 11-Tooth Sprocket the 06B SK2 attachment has

the 06B SK2 attachment has a straight tab on both sides with two holes each for mounting

Roller Diameter (D): 5

Part Number: 05B-2

Something else that is notable about this 08B24 sprocket is that it fully meets all ISO Standards

08B23 Sprocket With Stock Bore 11-Tooth Sprocket the 06B SK2 attachment hasThis 08B23 sprocket is a durable, high quality, and precision sprocket with 23 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 08B23 sprocket is that it fully meets all ISO Standards, which insures proper contact between the 08B 1 roller chain and sprocket thus preventing premature wear or breakage. This sprocket is also fully black oxide coated