Hello! Help asb.

I am trying to figure out how high the Aimpoint Micro spacers make the sight. It is for the H2 and it is those spacers you put between the standard base and the Aimpoint.

There is 30, 33 and 39. What does that mean?
Is that the height you end up with from the top of the rail to the middle of the screen? Or is that the height it is raised by?

Many thanks

This is how the spacer looks
https://www.google.co.za/search?q=Ai...QGxiSYCj-I5bCM