The 4 drawer one is actually bigger than the 6 drawer one. I forgot to post measurements which I will do tonight.

The 6 drawer unit measures 16-3/8 tall X 15-1/4 wide x 11 3/4 deep. 3 of the drawers are open with no liner, the other has divided compartments.

The 4 drawer unit measures 20 wide x 15-3/4 deep x 14-3/4 tall. All 3 drawers have divided sections for small piece storage.

These are both metal units, both are heavy.