Product details:

Solid Brass 180 Degree Adjustable Swivel with internal teeth that lock in at 5 degree intervals With Engraved Cast Cup. Rated for 100 Watt Maximum. UL/CUL Damp Rated. Fixture can be hung as a Wall or Ceiling Mount. 4.5 inch 2mm Heavy Cast Backplate. This fixture needs to be hardwired. Professional installation is recommended.