The CMI RP122 Pulley

Stainless Steel sideplates, 4" Aluminum sheave, Bushing, and Stainless Steel axle. 
MBS Rope Capacity Size Weight Efficiency
20000lbs 5/8" 8x4.75in 2.2lb 92.3%

Standard version: $56.00
NFPA version: $67.30