The Rudi Freudenthaler spinners are some of the finest in the world and Soaring USA is pleased to offer these fine propellor  accessories. These carbon spinners feature cooling holes and uses 2 allen screws to lock onto the motor shaft or a shaft flat. This "twisted" yoke spinner allows folding props to lay down closer to your fuse when the blades are folded, and the offset adds 7 degrees of pitch to your prop.