Flagpole Truck – ST-1 Series For external halyard poles — Cap Style — Single Pulley Cast aluminum construction with a 1″ outside diameter cast nylon pulley on a 3/16″ stainless steel axle. Designed to slip over the top of the flagpole and be secured by one 1/4″ — 2ONC stainless steel set screw. 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 size 10-32 stainless steel pan head screw. The recommended maximum halyard diameter is 1/4″. Fits pole diameter 1 3/8″, 1 1/2″, 1 3/4″, 1 15/16″ or 2″.