Your crampons need to be razor sharp so alloy crampons are not suitable.
[ ] Crampons – Heel clip and ‘French’ straps or thermoplastic ‘Y’ toe piece preferred. (See Note 6) The Grivel G12 Newmatic, Petzl Vasak Leverlock and Black Diamond Sabretooth Clip are all great however it is worth checking that they fit the curves of your boot(s). This is particularly important if you are bring two pairs of boots and will be changing from your 7,000m boots to your 8,000m boots on the summit push. Not all crampons are interchangeable with all boots. Your crampons need to be razor sharp so alloy crampons are not suitable.