How can I remove *ALL* borders from a qspinbox?

I have a treeview, and I need to keep as much information on the screen as possible.
My problem is, when I set the line height for the tree, the spinbox delegate can only show about half the height of the number. I did some digging, and found I could set the border to none in the stylesheet and that did help some, However, it didn't get rid of it completely.

You can see the bottom of the numbers getting cut off in this image:
http://i.imgur.com/Rffiix6.png


Any help would be appreciated.