This is a 7x5 Speed 400 Electric Pusher Propeller|
from Advanced Precision Composites.
For use on electric powered aircraft only, not for glow powered engines.
Constructed of Gray composite material
Two adapter rings that adapt to different motor shafts
7x5 Thin Electric Pusher Propeller, two adapter rings and
Assembly onto motor shaft or gear drive unit in electric plane
Hub inner diameter: 0.24" (6mm) where rings are installed
Inner Diameter of Rings: 0.188" (4.8mm) and 0.236" (6mm)