Edelrid - SpocThe Edelrid Spoc is an ultralight progress capture pulley, often seen used as a rope clamp for ascents, a simple pulley, or a pulley with a backstop for hauling and crevasse rescue. The 92% efficient ball bearing pulley and a spring loaded cam that locks automatically make it well suited to demanding conditions, with the cam's toothed design maintaining grip even on icy or muddy ropes. A cable pull releases the backstop with one hand, and the cam can