Petzl - Sarken CramponsTechnical mountaineering crampons The climbers secret weapon for technical terrain. With vertical, toothed front points, SARKEN crampons provide superior penetration on hard ice, while also providing solid purchase in snow. The distribution of their 12 points provides stability and bite on low angles, as well as steeper terrain. The LEVERLOCK UNIVERSEL binding system is designed to fit boots with heel welts.