These pulleys were designed for rescue operation by Russ Anderson. The sideplates are made of stainless steel. They rotate freely allowing the pulley to be installed on the rope at any point. The 2" pulleys have a 3/4" diameter carabiner hole while the 4" models accepts 3/4". Double pulleys have one becket with a 3/4" diameter hole for ease in rigging block and tackle systems.
