This Revolving Threaded Style Truck is designed to fit flagpole's with a top diameter 5 1/2"

It features the following:

Fits up to 3/8" rope
Aluminum Pulley
Truck Spindle 1 1/4" NPT Threading
Accepts a 1/2"-13NC ornament
Set screw for ornament
For up to 5 1/2" outside top diameter flagpole w/ female threaded fitting installed
Stainless steel ball bearing assembly for ease of operation, extended life, and strength