Rotatable structural bracket

A rotatable structural bracket includes a top plate for placement in a horizontal rest position on an end of a structural section that has an internal void. The rotatable structural bracket also includes a rotatable extension for placement into the internal void of the structural section. The rotatable extension can be configured as a wedge that is rotatable out from the internal void to angle the top plate at any acute angle relative to the horizontal rest position of the top plate. The top plate and the rotatable extension are of single-piece construction, and the rotatable extension rotates relative to the structural section and internal of the structural section. The rotatable extension also encompasses an opening of the internal void at any acute angle.