Strength: 20,000lbs Sheave: Aluminum Mechanics: Bushing or Non-Sealed Needle Bearing Sides: Stainless Steel Axle: Stainless Steel Max. Diameter: 5/8"/15.5mm Weight: 2 lbs. 3oz. /1005g Color: Stainless Part Number: RP122 (435528), RP123 (435529)|Weight: 2.2 lbs|MBS: 20,000 lbs (88kN)|Rope Capacity: 5/8"|Side Plates: Stainless Steel|Mechanics: Bushing (435528), Bearing (435529)|Sheave: 4" Aluminum|Axle: Stainless Steel|Size (in): 8x4.75|NFPA Version: Exceeds tests for national fire protection association standard on fire service life safety rope and system components NFPA 1983-2006 edition. *Not Certified*