Saddle Clamp Bolt size?

Hey guys, the hex bolt on my Cannondale SAVE PLUs seatpost's Saddle clamp is about to strip... anybody know the size of that hexbolt so I can replace it before it completely strip and need to take it out with a saw...? Thanks.
0
Posts
If you're anywhere near Cambridge, I can guarantee I'll have a spare in the garage.
Curtis 853 Handbuilt MTB, XTR, DT Swiss and lots of Hope.
Genesis Datum Gravel Bike, Pacentis (again).
Genesis Equilibrium Disc, 105 & H-Plus-Son.
Mostly Steel.