What are all these pieces?

[markba633csi]

Diemaker's square- but what are all these other parts for? I think I know what the 45 degree section is for, but not the other bits
-M

 

[Uglydog]

I use mine primarily for making foundry patterns as the adjustable angle is handy for managing the draft angle.
You may find this Tubalcain video helpful:

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Daryl
MN

 

[benmychree]

All those extra parts are used with the square for getting into confined spaces and setting common angles.

 

[Illinoyance]

The second screw is used for setting the draft angle on the blade. I think the proper term is die maker's square.