This is a flag mount that will mount to one of the rack mounts on the tower. The mounts are universal and can be mounted on the port or starboard side. 

The flag holder is just over 1 inch so it will accept a 1 inch flag pole. The minimum flag pole size is 5/8" in order for the knob to clamp on it.

Comes with hex keys for install to tighten once installed to set position.

Can be purchased in black or white. 

Flag and pole sole separately. link here