Work well,tried them the other week make walking easier, if you are unsure what crampons your boots can take then these are a must.

Does what they need to do with the flex to make walking that bit comfier, although I bought these to use on my Scarpa Freddom SL ski boots (MP 30.5) in order to extend my Grivel Airtech Light Newmatic ski touring crampons.Easily adjustable and very light but strong enough to take the abuse that a pair of relatively heay pair of plastic boots throw at them. Cheap.

I swapped these into Grivel Crampons which came with the original bar and now they fit my UK12 winter boots.

So far it seems to be a great replacement, even better for their purpose, ideal for long alpine approaches and glacier walking and more comfortable with more natural movement during walking.

Does what it says! Long crampon bar for my brand new Grivel Air Techs that fits my boots. An essential for anyone with size 11 feet and above.