The latest generation of Spektrum surface servos provides you with the performance you need for any 1/10th scale vehicle application. The S6400 takes the race-winning S6245 servo and upgrades it with a 25T output spline. The low profile design allows for space-saving installation, making it the perfect servo for 1/10 racing buggies and trucks, bashers looking to upgrade their RTR vehicle, or for crawlers that need that extra speed and torque to push through demanding terrain.