Five Oceans Plastic Black Plastic Rod Holder with Cap FO-2413 Flange dimensions: 4-1/2 (115 mm) x 3-1/2 (90 mm) Requires: 1/4" fasteners (not included) Tube I.D.: 1-11/16 (43mm) Tube O.D.: 2-2/5 (60 mm) Tube length: 8 (205 mm)