Inspirational 25++ Metal Shelf Brackets Lowes. Instructions on how to make diy farmhouse style metal shelf brackets from flat steel bought at lowes. The final cost for materials comes out to about a. These shelf brackets have a strong and simple design that turns any standard piece of lumber (1 x 8, 1 x 10, 1 x 12) into a clean and modern shelf capable of holding 100 lbs. Save on metal shelf brackets.