Five position switch Hi/Med-Hi/Med/Lo/Off For 7/8" inside diameter, 5" inside length bars. For ATV/Snow 7/8" x 5" & 7/8" x 5". The ATV Thumb Warmer can be used with ATV/ Snowmobile Heated Grips (#17-990) or splice into any existing heated grip set. The thumb warmer delivers a comfortable temperature to keep your throttle thumb toasty. Also sold as a kit.