Bolt on spikesender for ClimbRight/ Stein X2 with all new Rope Retainer technology! Unlike most purpose-built ascenders for climbing stirrups this bad boy places the rope away from the gaff... No more gaffing your rope! One handed rope application and removal is easy with the Rope retainer and accidental slip outs are a thing of the past. The Spikesender3 is compact, durable and versatile.