Bullet prop tail nut for 1/4 inch shafts.
Not actually a nut, but has a 1/4 inch hole with a set screw.
Hole depth is a little over 1/2 inch.
Bullet is about an inch long and about 1/2 inch diameter.
Made from stainless steel.
Not recommended to hold the prop in place unless you file a flat spot under the set screw.
Even then, putting this behind a lock nut would be better.
Includes a bullet nut and set screw.