TFL CNC aluminum 170mm Rudder with Triangle Rudder Bracket Specs: See picture 3 for the diagram.Length: 123mmHeight: 170mmMounting base; 30mm tall x 40mm wide3mm Brass breakaway rudder screw.Note: Uses 2mm diameter linkage rod. Good for use with boats in the 45 55" (1150 - 1400mm) range.