CMI 4 Dual Pulley Ss Bushing. Diameter: 5/8"/15.5mm Weight: 4lbs/1816g Color: Stainless Specifications for CMI " Heavy Duty Double 4"" Rescue Pulley Nfpa": Manufacturer: CMI Quantity: 1 Color: Steel Package Contents: CMI " Heavy Duty Double 4"" Rescue Pulley Nfpa" The CMI " Heavy Duty Double 4"" Rescue Pulley Nfpa" is a quality addition to the CMI lineup. For more great deals on Pulleys & Ascenders by CMI please browse our CMI Big Wall & Protection page.