These units are designed for 5" diameter poles and are used with a rope style internal halyard system. This unit consists of a hinged door mounted to the front of the frame and with a clam cleat mounted to the back of the frame.
The entire unit is inserted into the flagpole shaft and secured with 10 1/4" stainless steel screws. Lock & keys are included. A minimum hole opening of 5 1/4" high and 3 1/4" wide is needed.