In reply to T_Mac:
I took my boots (Scarpa Rebel Ultras) in to a shop to check fit. The points on the crampons stood out way too long when mounted on my boots. There are three adjustment positions for the toe bail, so you can adjust the length somewhat, but even mounted all the way forward, the points were a bit too long.
They look like good crampons. Sad they didn't fit my boots.