The traditional 1920-VCOB post top acorn is offered with variety of fitter options. The acorn shall be attached to an spun aluminum neck with 4 installed rivet nuts and stainless steel screws. There shall be a 1 - 16” closed cell gasket between the spun aluminum neck and the fitter. The neck will have an 8” diameter for insertion into the cast fitter. The luminaire shall be U.L. listed in U.S. and Canada.