Cast metal rudder arm with set screw drilled and tapped. Set screw is included.

Takes 3/16" rudder shaft
Over length (from shaft insert to control rod end): 1-3/16" (30mm)
Width (looking at it as a "V"): 1-7/16" (37mm)
Diameter (at the shaft insert): 1/2" (12mm)
Control rod hole diameter: 1/16" (1.5mm)