This is the Hot Racing 27T/8T HD 0.9 Module High Pinion Bevel Gear Set.
FEATURES:

Compatible with Axial AR44 axles
Hardened steel for increased strength
Provides over drive for the front axle
YOU WILL RECEIVE:

One 8T Bevel Gear
One 27T Bevel Gear
High pinion design keeping center of gravity low
COMMENTS:

Now are updated to the six bolt pattern.
You can use on both 3 or six bolt pattern locker (232002 31404)
You will need SCXT125R to use SCX II, or Wraith 1.9