Sea-Dog Steering Wheel Maneuvering Knob fits Sea-Dog Steering Wheels 230111, 230212, 230115, 230211, 230215, 230313, and 230315. A steering knob attaches to the wheel for use in situations where maneuvering is excessive. It allows the driver to turn the steering wheel more quickly to place the vessel in its intended position. Constructed of investment cast stainless steel for corrosion resistance this knob is designed for use with 1" X 3/4" oval tubing.