The Petzl Vasak LeverWire is a lightweight, classic, 12 point steel mountaineering crampon compatable with automatic style boots. Walking on 10 points: length of points designed for optimal stability, lateral points are separated to respect the asymmetry of the boot and to limit the "rail" effect which increases the risk of slipping, supplied with ANTISNOW to help prevent snow build-up. 2 flat front points for increased holding power, tapered points for good penetration on ice, next 2 points inclined to give stability. Adjustment is easy (no tools) and precise (to the half-size). Rapid-fastening lateral binding system avoids the bulk of a heel-bail. Certification CE - UIAA Technical specifications Sizes: 36 to 46 (M bar supplied) and 41 to 50 (L bar optional extra) 920 g