Petzl Bm'D Carabiner Color:Black 15 and 20 m) 15 and 20 m) These pulleys configured as “set of fours” (double blocks) will enable the rescue practitioner greater versatility in a personal mechanical advantage (PMA) for rescue and general rigging ensures an improved strength to weight ratio May be used with a CAPTIV positioning bar to favor loading of the carabiner along the major axis
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