KNOT PASSING PULLEYS Ideal for use as Carriage Pulley Heavy Duty knot passing pulleys. Rotating sideplates and a rigging point that will accommodate three 13mm carabiners. Aluminum pulley sheave for durability. 2 sizes for use on ropes up to 5/8" WIDE PULLEY- for ropes up to 1/2" diameter The large hole in the center of the sideplates will accept an Big Hook carabiner (p/n 605152) for balanced hauling when unit is used as the top support pulley in rope traverse systems. Pitch Diameter: 2". Color: Red. EXTRA WIDE PULLEY - for ropes up to 5/8" diameter The Extra-Wide Pulley is the only pulley that will pass knots in 5/8" ropes. 3" wide sheave with Oilite bushing. Pitch Diameter: 2.75". Color: Gold. Meets NFPA /ANSI/OSHA strength specifications.