Tubeaxial Companion Flange For Fan Diameter 12 in For Fan Type Tubeaxial Mounting Hole Diameter 3/8 in Material Steel Body Diameter 13 1/2 in Bolt Circle Diameter 13 3/8 in For Use With 4C659 4TM80 Includes Predrilled Mounting Holes Inside Diameter 12 1/2 in Outside Diameter 13 1/2 in Overall Width 1 1/2 in Product Type Companion Flange 1 Pair