For External Halyard Poles. Treaded Type, Stationary with Single Pulley. Molded fiberglass construction with 3/4 in. outside diameter nylon pulley on 3/16 in. stainless steel axle. The stem of the truck is designed to slip in to a 2 in. inside diameter pole top and is held in place by drilling through the pole and securing the truck to the pole with an appropriate size bolt or screw (not included). The top of the truck is designed to accept an ornament with a spindle threading of 1/2 in. -13NC. The maximum halyard size is 1/4 in.