Any idea? It isn't what I first thought, is it ?

[GKMan]

About six inches long and tapered to a smooth point. Hollow inside and made of aluminum perhaps.

 

[Dave~UT]

n/t

 

[GKMan]

Diameter is an inch and it is five inches long

 

[RustyNTX]

n/t

 

[GKMan]

It is not threaded.

 

[Aarong81]

It looks dirty. And it also has dirt on it.

 

[GKMan]

It is one of the more unusual items I have found.

 

[RustyNTX]

http://i.ebayimg.com/t/COLLECTIBLE-ALUMINUM-CIGAR-TUBE-HOLDER-CASE-MONTECRISTO-PARTAGAS-QTY-2-/00/s/NzY4WDEwMjQ=/$(KGrHqV,!jMFC1oDTmeKBQu4S)7pU!~~60_57.JPG?rt=nc

 

[GKMan]

Good idea, Maybe a reusable one? The aluminum is thick. probably about a 3/8 of a inch all the way around

 

[dave5710]

So the hole inside is only a 1/4 inch?

 

[GKMan]

No, about a half Inch.

 

[Steve O]

Could that groove have once held a rubber O ring?

 

[Ism]

It looks to me like a guide or alignment pin. The groove is squared off so its not likely for an O-ring. Maybe a snap ring or some other retainer.
Since it's aluminum, its not for rugged use. That might help point towards its purpose.

 

[DiggerODirt]

I am thinking something hydraulic in nature

HH,