Heavy-duty L-shelf brackets are made of 4 mm thick metal with a well-painted matte black finish for rust resistance and long life. The corner brackets are further reinforced with wider metal and 2 mounting screws near the bearing locations to support up to 300 pounds. This is excellent craftsmanship, which you can recognize by feeling the patterns and welds. Stylish design makes your deck beautiful. This decorative shelf bracket is suitable for bedroom, living room, kitchen or bathroom, indoor or outdoor use, such as bookshelf, wall shelf, heavy duty garage shelf. All mounting screws are included for easy installation. 100% SATISFACTION GUARANTEE: If you are not satisfied for any reason, please return it within 30 days for a full refund, we will always provide you with an exceptional product and ensure you are satisfied with your customer experience!