For external halyard poles — Cap Style — Revolving — Double Pulley Cast aluminum construction with a 2″ outside diameter cast nylon pulley on a 1/4″ stainless steel axle. The bottom portion of the spindle is designed to fit over the top of the flagpole and is secured with three stainless steel set screws (1/4″-20NC on the RTC-1-2 and RTC-1-138 & 5/16″-18NC on the RTC-1-238). The top of the spindle 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. The ornament is secured to the truck with a 1/4″-20NC stainless steel set screw. For ease of rotation, product life and strength, these trucks utilize self-lubricating ball bearing assemblies. The recommended maximum halyard diameter is 5/16″. 1-3/8″ or 2″ or 2-3/8″ Bronze, Black or White.