Rottefella Back Country Magnum is a solid and extra wide binding that is especially suitable for rough mountain hikes and expeditions. Manual opening and automatic closing mechanism. Minimum ski width in 52mm. Well suited for rough mountain hikes and expeditions Extra wide binding for increased stability (minimum ski width 52mm) Suitable for rough terrain Screw binding Weight: 545 g  Length: 242 mm Width: 68mm  Shoe size: 36-52 To attach these binding to Zandra ice skates you need also Zandra screw set (sold separately).