The Lewmar Power Grip boat steering wheel is made with durable, marine-ready stainless steel and features a strong, stylish three-spoke design. The integrated Power Grip knob allows for precision handling and professional control.• Pre-installed Power Grip knob for professional control• 316 stainless steel for lasting weather resistance• Ergonomically designed with finger grips• Three spokes for strength and style• 3/4" tapered shaft and 1/2" diameter hub• Weld nut fits 5/8" threads• 15-1/2" wheel diameter | Power Grip Boat Steering Wheel with 5/8" Welded Nut - 15.5" Stainless Steel