CG-Lock is widely known and appreciated by drivers who autocross, do track days, and drifting. CG-Lock attaches to your stock seatbelt and provides up to 80% of the control of a full race harness. Simply clip on to the tongue of your vehicles seatbelt, pull up on the shoulder harness portion of your seatbelt and the lap belt portion gets and stays as tight as a race style harness. By eliminating sliding in your seat you can not only lower lap times but dramatically increase your safety in case of an accident. CG-Lock is only compatible with single pass style seatbelt clips.