Surface Plates - Granite

[EmilioG]

I have a Starrett 24” X 36” with threaded holes in the top surface. At first, I thought the holes would be more problematic than for their actual intent. But I was wrong, I use the threaded holes for many applications and I wonder now how I would do anything without them. You may also want to think about get a plate with threaded holes in it…Good Luck, Dave.

Yes, I thought about the threaded holes. That's an excellent feature. I could use those table clamps for hold down among other uses.
Now, what is the difference between a tool makers flat and surface plates? Thank you all.