This wrench holds the bell of the SunnySky x2204 motor while you tighten the prop nut.
The nubs hold the outer most slots in the bell.
"WithHex" has an 8mm and 5.5mm socket head as well as smoother curves and a more built up neck. I would recommend printing the "WithHex" version.
Printed at 80% infill with 2 perimeters and 2 top and bottom layers.