Over the years my bent metal bracket to hold my flag started to bend out of shape and would frequently drop the flag. It also started to droop when it was in place. Definitely a no go so to cad I went. Version 1 is a 25mm hole and version 2 is about a 21mm hole. I used Kreg jig screws to screw it into the post but the insert has a diameter of 8mm so anything should work. The angle of the pole is 45 degrees. I hope this model can help someone as much as it helps me.