What are these?

[Vesuvio234]

Might be car related?

 

[dandrummerman21]

Kinda looks like a Turbo encabulator

 

[DDoug]

Might be car related?View attachment 322563View attachment 322563

Or a "Locked thread"....

or the early signs of "Onset to Dementia".

 

[Rob F.]

I second the thread lockers....

 

[michiganbuck]

Kinda looks like a Turbo encabulator

Perhaps a left-handed ones.

 

[1yesca]

K-Series Race Timing Chain Tensioner