Heavy Duty Design: These heavy duty shelf brackets are finished with a black powder coat finish. The powder coat surface protects the metal bracket surface from humid indoor air and prevents the metal bracket from rusting outdoors.,Triangular structure: The 6 "x8" shelf brackets have a triangular structure and can hold up to 300 lbs(136kg). Welding Gusset design and each bracket is hand welded to support more weight.,Space saving:Heavy duty shelf brackets can be used to support floating and hanging shelf brackets. Can be used for ornate fireplace, bookshelf or countertop supports, kitchen shelves, patio walls, garden shelves, etc.,Easy to install:Equipped with 8 screws and 8 expansion tubes. There are screw holes on both sides of the wall shelf bracket. When installing, please fix the screws of the chassis bracket to prevent it from falling off.,Stable shelf bracket: triangle design fireplace metal bracket, triangle welded grommet size 0.8*0.8 inches, ensure the weight-bearing capacity of the bracket, you can hang items between two brackets, save space while you can also decorate the bracket.