The Hot Racing Arrma 6S Aluminum 29mm Differential Locker Spool is an aluminum differential locker hub for Arrma 1/8 models that use the ARA910983 29mm Diff Case. Fits the front, center, or rear differential. Package includes one spool. 
 
Features:
CNC machined solid aluminum, anodized red
Allows for better acceleration and climbing
Replaces differential spider and side gears (Arrma AR310985)
Fits 29mm front, center, or rear
Includes one spool
Recommended for off-road low-traction conditions to avoid damage to driveline components
Replaces differential spider and side gears (Arrma AR310985)
This Locker Spool Will only fit in 29mm Diff case ARA310983