Abstract: An improved binding strap fastener for attaching crampons (mounting climbing spikes) to mountain climbing boots includes a lever assembly and a retaining clip for retaining the lever assembly in a fastened position. The lever assembly includes a rigid, curved lever plate riveted to a portion of a binding strap. A leading end of the lever assembly is inserted through a "D-ring" attached to a connecting eyelet of the crampons and is forced against the D-ring to tighten the binding strap to a predetermined tension by rotating the lever assembly approximately 180 degrees. The lever assembly then is slid beneath the retaining clip to retain the lever assembly in its fastened configuration. The operations of fastening and unfastening the binding strap can be easily accomplished by a mountain climber wearing heavy mittens without the necessity of removing the mittens from his or her hands.