Strength: 13,000lbs Sheave: Aluminum Mechanics: Bushing Sides: Stainless Steel Axle: Stainless Steel Max. Diameter: 12.5mm/1/2" Weight: 26oz/725g 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: RP133NFPA|Weight: 1.55 lbs|MBS: 13,000 lbs (57kN)|Rope Capacity: 1/2"|Side Plates: Stainless Steel|Mechanics: Bushing|Sheave: 2" Aluminum|Axle: Stainless Steel|Size (in): 6.5x4.25|Efficiency: 0.917