Matte black shelf brackets with Countersunk holes The hidden shelf brackets can be used upward and downward and they are accurate 90 degree industrial wall shelves brackets. The holes on iron brackets are all countersunk design, it means that all the screws can be drilling smoothly and invisible. Floating Hidden Invisible Shelf Bracket The brackets can be totally hide under the board if it is over 1.6 inch thick. Upgraded design hidden sleek L brackets for your shelves. Heavy Duty Shelf bracket Our shelf brackets are made of 1/5 inch thick solid iron, heavy duty bearing 150 lbs each pair. Perfect decorative Shelf brackets for home decor and storage.