Easy, cheap alternative to Dayan Anchor Pieces

I may have missed something, but...how do these actually help anchor the piece? From what these look like, they're just screws in the pieces!?

I'm probably at a disadvantage because I haven't actually seen the anchors that you were trying to imitate.
 
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The smallest piece is the anchor piece. what it does is makes the edge hold on to the corners it is next to and prevents it from coming out avoiding pops.
 
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