Added to the popular Küryakyn ISO-Grips, this little jewel can make all the difference in the world on a long ride. The Throttle Boss is a small adjustable paddle that is positioned under the palm of the throttle hand allowing the driver to slightly relax their grip on the gas and still maintain a constant speed.Fits: Both ISO-Grips and ISO-Flame Grips (Can also be installed on the left grip for a matched set).6242, Extended ISO-Throttle Boss (1/4" Longer Than Standard ISO-Throttle Boss) (ea).