The most precise balancer on the market with specially designed balancing shaft with left and right hand threads. For 6MM Drone/Quadcopter Props. Balancing shaft is made of CNC machined aircraft aluminum for a precision balance. The aluminum wheels turn virtually friction free for superior accuracy. Works with these drones and more: DJI Phantom, Blade Chroma™, Hubsan X4 Pro®, 3DR Solo, Splash Great for creating stable video.