4.5 Inch Extra Heavy Duty Single Pulley Revolving Flag Pole TruckExtra Heavy Duty revolving style truck for external halyard flag poles. Cast aluminum threaded to fit standard 1-1/4 in. pipe thread. Sealed Upper and Lower Ball Bearing assemblies. Tapped for 1/2 - 13NC finial. Maximum Shaft Diameter is 4-1/2 inches. Made in the USA. Painted to match all finishes except satin.