This is in addition to the corner brackets designed by rawkstar320 at http://www.thingiverse.com/thing:989780. So on my long pegboard, I found that the center needed support. So I used the corners as a basis and created center support pieces. There are 2 versions, the longer ones provide more support further inward instead of just at the edge. Same screw setup, I recommend 4-40x3/8" button head screws for the cover.