The HD-6001HB is a great, general-purpose, standard-size servo that gives extra torque without sacrificing speed. Two ball bearings help reduce friction and improve performance. The lead is terminated with a standard “JR”-style connector, which is Futaba-compatible. The picture below shows an example of the hardware that might be included with this servo (hardware might vary).
If you are looking for a similar servo that is capable of continuous rotation speed control as opposed to limited-range position control , consider the Power HD continuous rotation servo AR-3606HB, which has almost the same size, weight, speed, and torque as the 6001HB.
Note that, as with most hobby servos, stalling or back-driving this servo can strip its gears.