▲Features 1.Fits standard destroyer wheels 2.Provides better steering control 3.Includes a locking nut,plastic cover and wrench 4.If driving becomes difficult (eg.Pain in arms, shoulders, back) Please use our steering wheel knob to relieve your pain and fatigue. 5.It is easily to handle it, even though you use the driving handle knobs by single hand 【Marine-Grade 316 Stainless Steel】Boat steering wheel knob made of marine-grade 316 stainless steel and mirror polishing enhances, rustproof, corrosion-resistant per marine standards. Withstands high salt spray and humidity, suits long-term outdoor navigation, offers excellent structural strength 【5-Minute Quick Installation】Marine steering wheel knob comes with a dedicated stainless steel wrench, no complex tools or professional skills required. One person can assemble it by hand, enabling efficient new ship fitting or emergency replacement without delaying navigation 【Widely Application】Fits for almost boat steering wheel knob spinner with rim diameter 5/8"~1" * 5/8"~3/4". The mounting clamp is designed for an oval ring bar. If your wheel is round stock, you could reshaped the lower piece slightly with pliers（Please check the your boat steering wheel Rim Dia. before purchase） 【Labor-Saving & Precise Steering】Ergonomic spherical grip suicide knob reduces steering effort by over 40% and enables millimeter-level course fine-tuning. Solves laborious manual steering and poor accuracy when berthing, navigating narrow waterways, boosting safety and efficiency 【Universal Compatibility】Works with most standard marine steering wheels. simple modifications fit special specs. Steering wheel knobs for boats, Yachts, Pontoon Boats. Ideal for old ship part replacement and new ship steering system upgrades