Strength: 8,000lbs Sheave: Aluminum Mechanics: Bushing Sides: Stainless Steel Axle: Stainless Steel Max. Diameter: 12.5mm/1/2" Weight: 15oz/425g Color: Stainless 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*|Part Number: RP132NFPA|Weight: 0.9 lbs|MBS: 8,000 lbs (35kN)|Rope Capacity: 1/2"|Side Plates: Stainless Steel|Mechanics: Bushing|Sheave: 2" Aluminum|Axle: Stainless Steel|Size (in): 5x4|Efficiency: 0.907