3/4" Bore, 10 Tooth Clutch for 40, 41 and 420 Chain (1/2'" Pitch). Genuine Comet Clutches with a Built-In Key. It does not have or use any Set Screws. Requires a 3/16" Keyway that goes all the way out to the end of the crankshaft. Performs clockwise or counter clockwise. Comet Industries USA.

  
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