This is the Chimp Systems "Grippy" Single, and is intended for use with helicopters that have an 8mm spindle shaft. Anyone who has worked on a RC Helicopter Rotor Head knows that removing the spindle bolts without damaging the spindle is an almost impossible task. Once the first bolt is removed, how do you remove the second bolt without damaging the shaft?
For this task, Chimp Systems has developed the Grippy! Grippy is a simple, robust and rugged tool, with individual sizes for each and every size spindle out there. Simply slide Grippy over the spindle shaft, and remove the bolt. The one way bearing in Grippy will grip on to the shaft and allow you to remove the other bolt, leaving absolutely zero marks or dents on the shaft.