For Internal Halyard Poles. Treaded Type, Stationary with Single Pulley. Molded fiberglass construction with a 1 1/2 in. outside diameter cast nylon pulley. This stationary truck is designed to be used on flagpoles that have up to a 3 1/4 in. outside top diameter with female fitting installed. The spindle has 1 1/4 in. NPT threading and is screwed into the top of the flagpole. The spindle is hollow allowing the halyard to feed from inside the flagpole. The top of the truck will accept an ornament with 1/2 in. -13NC threading as standard but can be supplied with other sizes of threading. Recommended maximum rope diameter is 5/16 in.