Marker Kingpin Brake
Here's what other sites are saying:
The Marker Kingpin binding can be set-up with a brake or without. The brake locks automatically when in walk mode, retracts easily upon step-in so there is no overhang and reengages immediately when switching from walk to ski mode.
History shows that every once in a while a revolution is necessary to stop kings when they've gone too far, and that is most certainly the case when your Kingpin Binding detaches from your ski boot, and your ski goes too far down the mountain. Marker's Kingpin Brake is definitely the revolution you want during these sorts of yard sales.
Historic Range: $9.95-$52.00