This is a professional drone propeller with very high efficiency for commercial drones with 6010/130KV motors or similar.
Both direction (RH & LH) propellers of 21x7 (Diameter x Pitch) are available.
This propeller will allow Your drone to fly longer missions, less overheat motors and prolong life expectancy of the drone.
This propeller can be manufactured by different ways:
See attached presentation of the design development as well as the CFD results to make sure this is the right propeller for Your drone.
The file can be converted upon the request.