These should easily fit 4 x 6" index cards as well as card dividers with taller tabs which commercially don't often get taller than 4 1/2".
See also microfiche divider guides.
These should easily fit 4 x 6" index cards as well as card dividers with taller tabs which commercially don't often get taller than 4 1/2".
See also microfiche divider guides.