When I built my gates I used nail on tie plates on the corners of the frame and a brace ran exactly the same way as the one in the pic. Over the course of 10 years they may have gained 1/4" sag in the middle. They look to be they same size as the one in the pic. When you put the hinges throw all the lag screws away and put some galvanized lag bolts. That's another good reason a lot of gates sag. I also make sure the first hole on the inside of the hinge lines up with the post. This allows me to put a lag bolt all the way through the hinge and post.
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