Robertson SR 71 Double Sheave Trolley
The SR-71 is a proven performer for zip line operations. 304 stainless steel, machined axles, with back up bolt. The sheaves are case hardened to a 56-58 Rockwell and spin on ball bearings to provide excellent wear characteristics. Built to accept two carabiners. This is one of the most popular zip line trolleys ever made. The SR 71 is rebuildable by the manufacturer when required.
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