Classic 12-point mountaineering crampon. For general purpose mountaineering, VASAK crampons are the way to go. Twelve points insure maximum traction in all conditions, whether you are climbing up steep slopes or ice couloirs. Available in all four lightweight binding systems for solid boot interface. FITS BOOTS: Sizes 36 to 46 with M linking bar (included). Optional L linking bar fits boots sizes 41 to 50 (T20850). 3-year guarantee. CE / UIAA certified. Available in four types of binding systems. SPIRLOCK: Ultra-compact binding system, the lightest of the line. Stainless steel wire heel bail, flexible binding on toe: quick to put on. Patented by Petzl Charlet. For boots with a heel welt. Toe piece made of plastic polymer, which remains flexible even in extreme cold. Forged front rings for greater strength. SIDELOCK: Lightweight and low bulk lateral binding system. The quick to attach side system does without the bulk of the standard heel bail. The stainless steel toe and heel bail wires are in direct contact with the boot for a precise, solid and sensitive fit. A high performance binding system for technical mountaineering and ski mountaineering. Patented by Petzl Charlet. For boots with toe & heel welts. LEVERLOCK: Micro-adjust heel bail. The webbing strap runs through the bottom of the heel bail to help avoid accidental release. Patented by Petzl Charlet. Flexible toe binding. Classic binding system for boots with heel welts. Heel bail design with thumb catch is easier to remove. Toe piece made of plastic polymer, which remains flexible even in extreme cold. Forged front rings for greater strength. WIRE/LEVERLOCK: Version of the LEVERLOCK with wire toe bail. The heel bail allows for micro adjustments. The stainless steel toe bail wires are in direct contact with the boot for a precise, solid and sensitive fit. For boots with toe & heel welts. Heel bail design with thumb catch is easier to remove.