Tarot TL68B38 CCW Anti Quick Release Propeller Base for RC Drone Heli for Choice (Red) Using 6061T6 Aluminum Full CNC Machining, Suitable for Motor Shaft is Less Than 4mm, and The M3 Mounting Hole is 12mm Section Motors. When Using The Quick Release Paddle Holder Anti Clockwise to Loosen, Counterclockwise to Install Tight, Easy and Convenient for Using, Only Lightly Tightened. QR Paddle Theravada  1 (19.5  11.5MM) 2.5g M3  6MM Round Head Screws 0.4g  2 M3  5MM Round Head Screws 0.4g  4