Hole Calibration Test Blocks

After I printed out my first 20mm calibration cube, I found my bot was quite accurate for outside dimensions (my 20mm cube measured 19.95mm....close enough). However, I found that holes were consistently undersized. So I created a set of calibration blocks to measure how much undersized the holes are and are they the same for different diameters?

The blocks have a series of holes in 0.1mm increments. The nominal hole is the one circled, then the other holes are smaller or larger in that