Clutch Bell Housing will provide improved strength for the front pinion sprocket.
Standard bolt pattern fits on all mini pocket bikes using the same style bell housing. Includes the the 6 tooth 8mm pinion gear sprocket.

 

Specifications:

71mm from center of one bolt hole to the center of the other (see other picture)
77mm inside diameter of clutch bell drum (see other picture)

Fits bikes with this 47-49cc engine