Saving grace, yes. Grace, no..
But.. by definition, I'm guessing, "saving grace" is grace that saves, so by definition saving grace for un unsaved is impossible. So, it's kinda pointless to distinguish here.
Would you agree that sufficient grace is given but not all respond to it.
I'm guesssing not, but I have to give it a shot.
Grace is unmerited favor. Sufficient grace (unmerited favor) is given in that all see enough of God through His creation to make Him guilty. God does not leave the world (even those who do not hear about Christ) without a witness of Himself. None will choose Him. All turn away from Him and instead set up gods to themselves that better match their desires in a god.