Constructed with an automatic step in design and a wide 56mm steering plate, the NNN BC Auto Cross Country Ski Bindings offer exceptional control, stability and ease of use. Automatic step in functionality. Audible click when closed. Ski pole pressure release system for easy removal. Designed for backcountry skiing. Skis and bindings are shipped unmounted and unadjusted. Skis, boots and bindings including track mounted bindings must be installed, adjusted and tested as a complete system by a qualified ski technician prior to use. Please contact our Customer Service Department at 888.463.6367 for help locating one of our stores that can perform the mounting service..