*Your grip needs to be larger than 1 3/8" diameter or the oversize will only slip and not work. If your grip is 1 3/8" or smaller you need the Standard CrampBuster. Full throttle control with a relaxed hand. Reduces hand fatigue and cramping. Comfortably fits your hand. Easier throttle operation. Eliminates throttle "creep". Doesn't lock throttle on. Crampbuster will rotate forward with ease, yet when downward pressure is applied by your hand, the throttle is regulated effortlessly and accurately without squeezing. Standard and Standard Wide in the 1 1/8" diameters are for all metric and standard sized grips. Oversized and Oversized Wide in the 1 3/8" diameters are for all oversized grips.