1/2" Floor Flange, Home TZH Malleable iron Pipe Fittings for Industrial vintage style, Flanges with Threaded Hole for DIY Project/Furniture/Shelving Decoration (10 Pack) - Amazon.com
SteelTek 1-1/4-in Structural Galvanized Floor Flange in the Structural Pipe & Fittings department at Lowes.com