The CMI RP123 Pulley

High strength at low cost!  Stainless Steel sideplates, 4" Aluminum sheave, Bearing, and Stainless Steel axle. 
MBS Rope Capacity Size Weight Efficiency
20000lbs 5/8" 8x4.75in 2.2lb 94.6%

Standard version: $67.30
NFPA version: $76.15