CMI ROPEJACK spike ascender It takes just seconds to

It takes just seconds to fold and unfold

reducing fatigue during long days of climbing

A wire core lanyard has a steel cable running through the center of the rope

Fanno saws up to 25"

CMI ROPEJACK spike ascender It takes just seconds toA Mechanical Advantage tool for pre tensioning static lines, light lifting and cabling. Small and light enough to carry aloft by a climber for Mechanical Advantage within the crown. Mechanical Advantage is approximately 5: 1. No pulleys, no extra rope, minimum weight, minimum friction, quick, easy on off, works well 'topside', too. Designed to be used by only one individual using one hand only, the length of the handle on the Rope Jack limits