This steering wheel spinner knob is one of those things you don't realize you need until you try it! It's this green ball-shaped knob that attaches to your steering wheel to make turning way easier. It's perfect for people who need a little help with steering - whether you're a beginner driver, someone with arthritis, carpal tunnel, muscle problems, or just want to reduce fatigue on long drives. Installation is super simple: you find the spot on your wheel where you want it, open the inner pad, slide it onto the wheel, align the covers, and lock it with the screw. The inner diameter of the ring is 1.2 inches, so it fits most steering wheels. If it's not tight enough, you can cut a rubber hose to use as a washer. It's made from resin and aluminum alloy with a PVC rubber pad to protect your steering wheel from scratches. The ball design looks cool and adds some personality to your car's interior. It makes U-turns and tight maneuvers much smoother, and you can steer with one hand comfortably. Great for cars, trucks, tractors, SUVs, even boats - basically anything with a steering wheel. Really handy little device that makes driving less of a workout!