This 4 way bracket is designed for a common middle bracket amongst 4 pergolas.   Construction is 3/16" thick high quality aluminum with fully welded joints.  Openings measure 3.6" by 3.6".   There are a total of 40 holes.
 
In addition to the bracket, you get the following
 
64x 2" Stainless Steel Wood Screws
64x Plastic washers
64x Screw caps