^^^Some salomon heels are 4 hole and some are 5. The break just screws into the binding, so if you have 4 screw heels don't drill the center hole.

I don't have a any experience with the all carbon skis. But I was under the impression for normal skis like the 4frnts, that the 3.5 was the desired size. The ski bits will be hard to find except...

Better to buy a ski bit. The tape can slide. Drill bit size depends on your skis construction. For a normal skis with no metal, 3.5X9.5 is the most common.