The Edson Sportsman Series Powerknob features a black polymer knob body and twin races of super-smooth ball bearings. All of this makes quick turns effortless while backing down on a fish, docking or maneuvering in tight quarters. Easy 5-minute installation gets you out on the water quickly with the ultimate in steering control. Ideal for flats boats and runabouts. Fits wheel rims from 5/8" to 1-1/8" in diameter. All tools and hardware included.