SIZE AND EASY INSTALLATION: The size of countertop support bracket is 100 x 100 x 21mm/4" x 4" x 0.83" (L*W*T). The package includes the accessories you need, the bracket package includes solid long screws to support the brackets of heavy duty and short screws for the board. We also sell 4in/5in/6in/8in/10in/12in for your shelves choices.,STURDY & HEAVY DUTY: Our shelf brackets are made of type premium grade Steel + Baked Black Paint which ensures the durability, resistants to bending and breaking, allowing it to remain looking its best for longer. Our L-shaped bracket is one body stamping, with no welding points on the surface to increase load-bearing capacity and resist breaking. A pair of L brackets can support up to 50 pounds.,CIRCULAR ARC ANGLE DESIGN: Our L-shaped bracket adopts arc Angle design to avoid stress concentration and increase the strength of the support, not easy to break. The thickened L-shaped design provides you with greater stability. Shelf hardware’s smooth curved edges protect your hands and walls. The beautiful look is the perfect decoration for the modern minimalist style.,MULTI-PURPOSE APPLICATION: The heavy-duty shelf brackets could be mounted on the wall to work as shelfs with board on it, can allow more DIY space in your garage, kitchen, shop, stores, workshops, boats, motorhome, backyard, trailer, room, kitchen, balcony, bathroom, etc.,BRAND ADVANTAGE: AISINYI support team is available to help with any product questions or needs. Your happiness and satisfaction are our top priority - if you're not satisfying or ever need any help, please feel free to message us on Amazon. We pride ourselves on providing only the best in high-quality products.