M5 Propeller Nut Cap CW CCW for 1306 and 3100kv Brushless DC Motor is the set of two different i.e CW and CCW Nut Cap for 1306 and 3100kv brushless motor to be fitted above the propeller.Propeller nuts of different directions usually come in different colors, such as black and silver for better user-friendliness.Basically, CW (clockwise) and CCW (counterclockwise) motors are still the same motors, apart from the prop shaft threads which have opposite directions. That means for a CCW motor, the prop nut is secured by turning clockwise. And for CW motors, the prop nuts need to be rotated anti-clockwise in order to fasten.