The dimensions of the bracket are 22mm x 12mm the cleat is the same size and the angle of the cut on the cleat is 18 degrees. For holding more weight, we recommend using extra brackets for extra support. The image depicting a person standing on the shelf illustrates the additional brackets needed for the extra support. These are easy to fit and all orders will include a printed copy of the installation guide. Fixing can be done with nails or glue. We recommend that shelf wider than 900mm should have extra support at the back shown in photograph. This listing is for the bracket ONLY. Please see other listings to purchase the Cleat which is the horizontal piece of wood joining the brackets together in the images. Shelf is not included. .