Bit holder for small 4mm bits

I needed a storage solution for the bits of my electric precision screwdriver because the one I had was too bulky!So I designed these two bit holders: one for 10 small bits and one for 20 small bits.What makes them special is that they have an internal clamping mechanism so the bits don’t fall out.Fits 4mm bitsPrint settings:Filling: 15Support: NoLayer height: 0,2mm