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CMC’s high efficency pulleys feature precision sealed ball bearings for minimum loss of mechanical advantage in compound or complex pulley systems. The large carabiner hole accepts multiple carabiners. The high strength aluminum sideplates have a smoother, rounded, more rope friendly edge. The bottom is shaped for maximum efficiency with Prusik hitches and also works well with Gibbs type ascenders. Anodized aluminum sheave. Low profile axle fasteners help eliminate the possibility of snagging when the pulley is moving.