the 08B K1 attachment has a bent tab on both sides with one hole each for mounting
08B13H sprockets with a stock bore comes with the standard 10 millimeter inside diameter hole with no key-way or set screws and can be easily machine bored to custom sizes
Something else that is notable about this 100B13 sprocket is that it fully meets all ANSI Standards
100A22 sprockets with a stock bore comes with a 1-1/4" inside diameter plain hole and can be easily machine bored to custom sizes
1008 Taper Lock Bushing X 25mm Bore Stainless Steel Roller Chain the 08B K1 attachment hasThis 1008 taper lock bushing is a high quality, durable, and dependable product that has been precisely manufactured to out last and out perform the competition. 1008 taper lock bushings are used in a wide range of applications including; belt pulleys, sprockets, drum pulleys, drive pulleys, tail pulleys, sheaves, and gears, which are items that we also offer! Additionally this bushing features a 25 millimeter bore with a standard keyway, for more