It allows you to change out the twist throttle to a thumb throttle.
The kit includes:
Throttle Cable
Thumb Throttle housing
Master cylinder Spacer (to space out the master cylinder)
2 Bolts
This works on most 4 stroke bikes Carb and EFi.
You will only get 1 cable, in which case you will use that cable in the "pull" side of the carburetor/throttle body and the return is the thumb throttle housing spring*