PowerKnob Sportsman - Black, The Ultimate In Steering Control! The rugged and economical Sportsman Series PowerKnob features the same ball-bearing design and ergonomic shape as the ProSeries. The Sportsman Series Knob is built of black polymer and marine-grade stainless with precision milled bearing races. improves handling and performance, Maneuver with precision and confidence, Twin races of fast action ball bearings. All-weather construction, Strap or bolt onto virtually any steering wheel, smooth ball bearings, easy 5 minute install. Great for Boats, Tractors, Golf Carts, Off-Road, Maintenance Vehicles, Lawn Mowers. Includes: (1) Sportsman Series PowerKnob, (2) Wheel Rim Straps, (1) 1/4" Allen Wrench, (1) 2" Cap Screw for Thru-Bolting.