ARRIS 2204 Motor Guard Protector for FPV250 250 Racing Drone Quadcopter 4pcs It can fit any FPV racer which has arms with flat motor mounting surface. Any motor with outer diameter less than 29 can be used on this protective guard, but we suggest 2200' s series motor such as ARRIS 2204, EMAX MT2204, Sunnysky 2204, etc considering the size matching. Quadcopter requires 4pcs, while hexacopter requires 6pcs. P The package only includes M3x8 screws, which are specially designed for the 2204 motor. If you want to use it on 1806 motor, please prepare M2x8 screws by yourself.