Size The dimension of the concealed bracket is 12 x 120 mm. The total length of the bracket is approx. 195mm, including 75mm expansion tube (with 12mm diameter) and 120mm support rod (with 12mm diameter). Easy to Install Comes with complete accessories for mounting, you can easily install the shelves on the wall. First, measure the size of the diameter of the bracket and drill holes in the wall. Then insert the extension plug into the wall hole. Then drill holes in the wooden shelf (depth and diameter depending on the hidden support). Finally, mount the shelf on the bracket until the knurled part. Wide ApplicationHigh quality and reliable, it has better load-bearing capacity You can mount these brackets hidden on the wall as you want, they are perfect for decorating your kitchen, bedroom, library, Living room, bedroom, office, etc. Concealed bracket to support floats on hidden measures. Stylish storage solutions that make your home more beautiful and organized. These hardened steel concealed shelf brackets are the strongest brackets around. These brackets are only suitable for mounting the shelf to a brick or cinder block wall or directly to a wooden stud of an internal plasterboard wall. Application: Concealed Mounting Shelf , mounting on timber or masonry walls. Suitable for all domestic applications, especially shelving systems, radiator screens and telephone holders. Features: 1. Concealed bracket to support floating shelves. 2. The stylish storage tool will make your home more beautiful and organized. 3. These hardened steel concealed shelf brackets are very sturdy. 4. These brackets are only suitable for mounting the shelf to a brick or block wall or directly to a wooden stud of an internal plasterboard wall. Features: - Material: nylon and iron. - Size: 12 x 120 mm (drill recommended shelf/wall: 12 mm). Quantity delivered: 8 pieces