Guess what this is a photo of!

[Buck]

How about sharpening a pencil or mitering the end of a dowel pin?

 

[Uncle Bob]

Size is what 1 to 3 inches tall?

Pencil sharpener?

 

[pacanis]

No. Nothing remotely related to plugging or...... valving (?)

 

[pacanis]

Does not sharpen or shape in any way.
It's about thimble sized.

 

[Uncle Bob]

Used alone or in pairs or groups of four?

It goes on the end of a walking cane or something.......

 

[Buck]

Is whatever goes into the hole made of wood or metal?

 

[pacanis]

While usually found in pairs, the pair have something very opposite about them.
.... or something.

Always metal, Buck.

 

[Buck]

Is it a form of retaining clip or plug?

 

[Uncle Bob]

Do they screw on, or slip on?

Are the pairs on the same piece of metal?

A "cap" to keep a wheel on?

 

[miniman]

Curtain pole ends??

 

[pacanis]

They screw
They are not attached to the same item
Nothing to do with curtains or retaining anything

 

[pacanis]

They are not attached to the same item

oops. This may not be entirely true.
They are attached to the same "item", but the item has more than one part, so you could look at it either way

 

[Buck]

When used in opposite pairs are they threaded left hand/right hand?

 

[pacanis]

Lefty loosey, righty tighty.

 

[Buck]

Is it used on a bicycle?

 

[Uncle Bob]

They screw on to hold something in place...like a lamp shade. Something goes on lthe rod then this object screws to to hold it....Right???

 

[pacanis]

Nothing to do with a bicycle.

They (or the one) has absolutley nothing to do with holding anything in place.

 

[Buck]

Is it used to seal the end of a hollow tube?

 

[pacanis]

No, nothing to do with sealing either.
You also would not say they capped anything, but they do go on the end of something.

 

[Buck]

Is it used to strike something?