I never used the holes on the saw. I sit in front of the saw and to see which blades are in the tubes in those slot/holes I would have to get up or lean way over. At my age, I don't like to lean way over,,, been known to end up on my face. I use the cheap plastic test tubes from Ebay, and a cheap plastic test tube holder from Ebay also. It sits next to my saw so I can easily reach it. The test tube that holds the blades I am currently using lays in a little holder on the saw stand.