This handy assist provides more leverage and the ability to use the palm of a hand to apply the throttle. This virtually eliminates the chance of a tired or sore thumb after a long day of riding. It has a comfortable ergonomic shape and non-slip surface. Made of a super-tough nylon core overlaid with soft rubber for added comfort. Fits all ATVs without modification to the existing throttle tab and installs in minutes. The Thumb Assist Pro Adjustable offers the added versatility in placement for your riding comfort. Lever adjusts up and down, toward and away and rotates to optimize control for riders with hands of any size.