Tubeaxial Companion Flange For Fan Diameter 54 in For Fan Type Tubeaxial Mounting Hole Diameter 1/2 in Material Steel Body Diameter 57 3/4 in Bolt Circle Diameter 54 5/8 in For Use With 5JKE4 Includes Predrilled Mounting Holes Inside Diameter 54 5/8 in Metal Material Thickness 5/8 in Outside Diameter 56 1/4 in Overall Width 1 1/2 in Product Type Companion Flange 1 Pair