All Rite Products Thumbuddy Pro Throttle Extender Bolt on thumb throttle extender works on most large and small ATV thumb throttles; Not recommended for oversized and odd shaped thumb throttles 2-piece clamp design easily bolts on; Stainless steel segments clamp together over the thumb throttle to provide a reliable and comfortable throttle control Stainless steel core covered in thick soft rubber Extender can be bent and formed to provide a custom fit for large and small hands Ergonomic rubber coating helps to relieve thumb and hand fatigue from a long day of riding