, Praket, brace folds up & down to 45-degrees to 90-degrees Heavy duty. I came across them in a search at Home Depot
, but you have to order them from the service desk. 12"-inch and 18"-inch
comes 2-two to a pack. Just find a wall add a board and you have a shelve. They are heavy-duty. I'll take a photo and add it to this post tomorrow. Has 1/4-holes for mounting board with screws.Made of Metal.