A well-known system which relies on a nylon speed lever in the rear and a stainless-steel front bale to hold the boot. Quick to put on, the Grivel G14 Cramp-O-Matic Crampons are perfect for mountaineering boots that have a rigid sole and substantial heel and toe construction. The stainless-steel safety strap, which was invented by Grivel, is permanently mounted on the front bale and prevents loss of the crampon should it be forced off the boot.