Square Floor Flanges, also known as Floor Plates, provide a stable, reliable, flat surface to mount chain link fence posts or tubing to concrete or cement. Square Fittings provides Weld-On Floor Flanges ranging in square sizes of 4" Sq. to 8" Sq. and even the hard to find 3" x 6" flange. All Floor Flanges have a corrosion-resistant pressed steel construction with a galvanized finish to ensure durability for years to come.