Choose the model Thru hull flush mount chromed brass 3/8" x 15 mm Thru hull flush mount chromed brass 1/2" x 19 mm Thru hull flush mount chromed brass 3/4" x 24 mm Thru hull flush mount chromed brass 1" x 30 mm Thru hull flush mount chromed brass 1"1/4 x 38 mm Thru hull flush mount chromed brass 1"1/2 x 45 mm Thru hull flush mount chromed brass 2" x 56 mm