I agree it is a Galvanized Gazebo Rafter Tie. Center bracket is just for rafters to butt against. Appears to be light duty since most have U-shaped rafter brackets. May also be a retrofit post bases since the center bracket can be opened and wrapped around an existing hexagon shaped post. Unknown manufacturer.

It is a construction bracket to attach a hex post which has been cut out of a 6 x 6 timber. (approx 5-1/2" hex) It can be used for vertical posts. It can be used for the center connection for the roof framing of a 6 sided gazebo. The holes are for lag screws, nails, or Simpson Strong-Tie screws. Simpson Strong-Tie is the name brand of construction brackets, but they do not seem to have one like this. References given are similar examples, not exact. I would call these "Hex Post Brackets" or "Gazebo Center Post Brackets".

References:

https://cdn.instructables.com/FPN/2PKB/IJ7WO978/FPN2PKBIJ7WO978.LARGE.jpg

https://www.amazon.com/Simpson-Strong-GT6Z-16-gauge-Gazebo/dp/B0089ENPV0

http://woodsgood.ca/images/Gazebo-RafterPostDetail-2.jpg

Reason:
Hi, I see what you are talking about, but I cant seem to find anything that has the hex hole in the middle, can you please provide a link to one with the hex hole

I agree it is a Galvanized Gazebo Rafter Tie. Center bracket is just for rafters to butt against. Appears to be light duty since most have U-shaped rafter brackets. May also be a retrofit post bases since the center bracket can be opened and wrapped around an existing hexagon shaped post. Unknown manufacturer.

References:

https://www.strongtie.com/decksandfences_miscellaneousconnectors/gt_tie/p/gt