SummitLink Blade 350 QX 1 QX 2 QX 3 CNC Aluminum Self-Tightening Propeller Adapter for DJI Phantom Prop CNC Aluminum Propeller Self-tightening Adapters for Blade 350 QX Series These adapters are color coded for easy and correct installation They fit on stock BLH7802 of 350 QX that allow you to install all DJI Phantom props onto your 350 QX for better performance. They fit on Blade 350 QX 1 QX 2 and Blade 350 QX3