【Reliable Material】: The Marine Spinner Steering Wheel Knob is made of 316 Stainless Steel, which is strong and wear resistant, ensuring long term percompatible withmance and reliability 【Function】: Marine Auxiliary Booster, making your control more stable, saving time and efcompatible witht 【Application】: Ball Turning Helper, suitable compatible with most steering wheels with rim diameters from 5/8 inch to 1 inch, suitable compatible with ships and yachts 【Easy to Use】: The Hand Control Knob is accurately designed and comcompatible withtable to hold, so you can easily control the yacht and enjoy a convenient experience 【Easy to Install】: The Spinner Knob comes with a small wrench, which allows you to quickly install it on the steering wheel without complicated procedures, and is easy to use Specification: Material: 316 Stainless Steel Size Chart:6.8 cmx3.5 cm/2.68 inchx1.38 inch, Diameter 1.59 cm-2.5 cm/0.63 inch-0.98 inch Package Includes: 1x Marine Spinner Steering Wheel Knob 1x Wrench Note: Please allow slightly 1-2cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed.