Fits 12 Inches Large Board 20 Pack 12" L x 8" H open shelf brackets will fit lumber boards 12 inches deep or above. DIY Shelving Brackets You can match all kinds of boards with these l shelf brackets to style your wall shelves in your workshop, kitchen, garage, laundry room and turn your shelving system into industrial farmhouse rustic looks. Symple Stuff | Symple Stuff Elvira Shelf Bracket in Black | 12" H X 1" W X 8" D | Wayfair