Guess what this is a photo of!

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Andy,They are not white dots. Something in the lighting makes them appear to be white. There are 4 rows, and they are stainless steel like the tip is. Modern ones are completely stainless, I think! No paint envolved. Clue: It takes several of these to perform its task!
 
Does reflected light play a part in its operation?
Are there four of them working together?
Do the multiple points work together to hold something in place?
 
No light of any kind is needed. They would work just as well in the dark.
There are hundreds of them working together....
The multiple points (dots) four rows of them do hold something but very briefly! Not in place...
 
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