The HD-3001HB is a great general-purpose, standard-size servo. 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 comparable size, weight, speed, and torque.
Note that, as with most hobby servos, stalling or back-driving this servo can strip its gears.