Short answer: it really can not be?
From the grid description:
Remember, grid columns should add up to twelve for a single horizontal block. More than that, and columns start stacking no matter the viewport.
The number 12 was chosen because of its high versatility (you can have: 1,2,3,4,6 or 12 columns), but there are always some warnings for such solutions: they require some conformity to its standards.
Now, what happens when you create 7 divs as follows: <div class="col-md-1"> ? I did a quick test and well, I have 7 columns. Of course, they only occupy 7/12 of my container width, so if this is acceptable you can roll with it.
If not, you will either have to use your own solution (using existing bootstrap classes, or start from scratch), change the load (perhaps, but I would advise because it creates problems for future support), or change your design. Or maybe just use some other component / template?
Gerino source share