The CMI RP124 Double Heavy Duty Pulley features stainless steel sideplates, two 4" aluminum sheaves, bushing, and stainless-steel axle. 

Specifications:

• Sheave Diameter: 4" (2)
• Max Rope Diameter: 5/8"
• Body Material: Stainless
• Sheave Mechanics: Oilite Bronze Bushing
• Sheave Material: Aluminum
• MBS: 25,000 lbs
• SWL: 5,000 lbs
• Width: 4.75"
• Height: 9.0"
• Depth: 2.048" (sideplate to sideplate)