This is a propeller bearing for indoor and outdoor rubber powered free flight model airplanes. This is designed for small airplanes from 12” to 20” wingspan that use a motor stick (e.g. NOCALS, Cloud tramp, small stick models etc.). You will need to make a propeller shaft using 0.8 mm (1/32) did. piano wire. You can open the hole up slightly for a 1 mm shaft and a 0.6 mm shaft would work ok as well (it will be slightly loose).

If you want me to make a shaft for you with a reverse S hook I can do so for an additional $3 (see options when ordering).