Tusk Handlebar Grip Heater Kit w/Molded Grips & Digital Control & Thumb throttle warmer kit Tusk handlebar grip heater kit w/molded grips and digital control (includes thumb throttle warmer) Large injection-molded grips with built-in heat panels Heat level is controlled by a digital switch that will let you choose five different heat settings or turn them off entirely Designed for ATVs with thumb throttles; will not work with twist grip throttles Inner diameter 7/8"