The Flagpole Top Adapter is used in mounting a truck that has a spindle threading of 1 1/4" and the pole does not have a threaded top plug installed.
The adapter is tapped 1 1/4" and is designed to slip over the top of the pole and is secured by three 1/4" stainless steel set screws. This adapter will fit a 3 1/2" diameter flagpole.