Orbit Block Stand-Up Base, 1,100lb.SWL, 0.9oz. from RONSTAN
The precision design provides the optimum number of ball bearings in critically loaded areas, eliminates them in inactive areas and reduces ineffective mass, creating the "2-stage" bearing system for durability and low friction performance. Sheave: Carbon-fiber reinforced, PTFE-impregnated engineered nylon. Bearings: High-compression–strength Carbon Black Acetal; Stage 2 Bearing: Glass fiber-reinforced, MoS2-impregnated engineered nylon. Sheave Size: 2-5/32" (55mm).
$7.66