RP146 CMI Giant Arborist BlockFinally, a giant block for your beefy ropes! The aluminum sheave turning on bushing and a stainless steel axle will handle up to 1″ rope. Oversized blue aluminum sideplates protect your lowering lines. Specification:Min breaking strength: 68,000 lbs.Weight: 6.6 lbs.Dimensions: 9.25″ x 6″