QToolButton Icon without Border?

Heyoo!

I'm trying to set my QToolButton Style to ToolButtonIconOnly, but nothing happens.
What am I forgetting?

In the attached image, My button has the border- which I'd like to remove. I would like it to look like the icons just to the right of it. Is my Line 7 not correct?

Code:

try:
            if c.toolTip().startswith("Flipbook this viewer"):
                print c.toolButtonStyle()
                snapshotToolButton = QtWidgets.QToolButton()
                snapshotToolButton.setBaseSize(16,16)
                snapshotToolButton.setIcon(QtWidgets.QIcon("C:/Users/nfran/.nuke/icons/cameraIcon.png"))
                snapshotToolButton.setToolButtonStyle(QtCore.Qt.ToolButtonIconOnly)
                snapshotToolButton.setToolTip("Take Snapshot")
                c.parentWidget().layout().insertWidget(0,snapshotToolButton)
                return c
 
        except: pass

Attachment 13167