World war 2 artifact help?

[hbru123]

I found these two weird bolts sitting next to 20 cartridges from an M1 Garand at a world war 2 training base and I can not figure out what they are??

 

[Bigcypresshunter]

Gonjji Stones?

 

[releventchair]

If threaded inside they could have gone on studs either on or through plating.

 

[Charlie P. (NY)]

I'd say hex pipe caps if they are threaded inside.

 

[Bigcypresshunter]

lug nuts?

 

[hbru123]

Awesome thanks so much!!

 

[cudamark]

Cap nuts. Used when you don't want exposed threads on a bolt/stud.

 

[NOLA_Ken]

how big are they?