Bit Holder with magnet Holes

One of my tool kits has a couple pucks for holder driver bits.
They're cheap and constantly drop the bits.
So I threw together a model that increases the number of bits I can hold: was 10, now 12.
Also, I added a couple of holes in the back for 3mm x 3mm disc magnets.
Then I added a couple of reliefs so I can easily grab it.
Fill it up!