Used for 2.3mm motor shaft.
The meaning of 2.3 mm (0.7-1.4) is the motor size is 2.3 mm,clamping drill of 0.7 mm to 1.4 mm.
Concentricity adjustment method: Before lock bit need to adjust the concentricity, otherwise there will be a violent vibration,
power on rotate awhile on the smooth surface of the floor or glass, lock bit after bit concentric.