What are the pins sticking out of the clinsert?

After screwing the clinsert (by hand or with a tool) until the pins reach the
upper

surface of the material. Depending on the size of the clinsert, such will have

2 or 4 pins

The next step is to drive/tap the pins into the parent material the with the

installation tool.

https://www.youtube.com/watch?v=rxQjcA-KglA

The pre-assembled pins, once installed provide with a positive mechanical lock
that

acts against rotation and vibration.