This bracket is used to hold up one side of a shelf in a bathroom vanity. The other side of the shelf is held by standard shelf pins. Requires a nut and bolt. 

CAD source: https://cad.onshape.com/documents/08ac9c61906685feddeb4acf/w/d6ae98faf10e66858ab8986e/e/140f3781f073b1c43fec02d6