Specifications:

²  Inner Diameter:  4.0mm

²  Applications:  Suitable for XXD 2217 Motor or motor with 4mm shaft

Instructions:

²  Put the propeller protector on the motor, and tighten with screws.

²  Put the propeller on the protector, and then put the O-ring on the two sides’ screws.

²  Check to make sure there are no loose screws.

²  If propeller touches with ground in flight, which is just off the O-ring, so that not only avoid broken prop, it also protect not damage in the motor.