Arborist-specific: CMI RP110D Micro Double Rescue Pulley with double sheave purple anodized aluminum sideplates, two 1 1/4inch aluminum sheaves, bushing, and aluminum axle. Features & Specs: MPN: RP110D Features- Excellent to create 3 or 5 to 1 lifting or pulling systems. Color: Purple Rope Diameter: 1/2" Working Load: 1400 lbs. Dimensions: 3.5" x 1.75" Tensile Strength: 7,000 lbs. WLL: 1,400 lbs Material: Aluminum Weight: 4.5 oz. MPN: RP110D