This is a Montbell Kajitax 10-point crampon. I purchased this new and unused, and have kept it in storage without using it. I'm selling it because I usually use other semi-automatic crampons and haven't had a chance to use these. I had it fitted to SCARPA hiking boots size 42, but it has adjustment range in the front and back (about 2cm in the back, 3cm in the front). "XB10" is the model number for the "10-point one-touch crampon" from the Kajitax brand, which Montbell used to carry. Currently, Montbell sells a similar product as the "LXT-10 Crampon."