ARRIS M5 Quick Release Self-Tightening Prop Adapter for Brushless Motor of RC FPV Racing Drone (2 CW + 2 CCW) This is M5 Nut for installing the FPV Racing drone motors. Compatible with all 5mm Prop Motors (1800 - 2400 brushless motor), such as ARRIS, DYS, EMAX etc. Most common Shaft Size. Made of Aluminum alloy, light weight, high strength, corrosion resistance. Package includes totally 4 pcs nuts, 2 for CW motor and 2 for CCW motor.