Flagpole Truck – ST-32 Series For external halyard poles — Cap Style — Double Pulley Cast aluminum construction with a 1-7/16″ outside diameter cast nylon pulley on a 1/4″ stainless steel axles. Designed to slip over the top of the flagpole and be secured with three 5/16″ — 18NC stainless steel set screws. The top of the truck is designed to accept an ornament with a spindle threading of 1/2″ — 13NC as standard but can be supplied with other sizes of threading if desired. The ornament is secured to the truck with a 1/4″-20NC stainless set screw. The recommended maximum halyard diameter is 5/16″. Fits pole diameter 1 7/8″ or 2 3/8″.