For removing and tightening of grooved nuts 

according to DIN 981 standard on shafts, clamping or pulling sleeves etc. 

Suitable for following groove nut sizes: 

1/2" drive: KM4 - KM5 - KM6 - KM7 - KM8 

3/4" drive: KM9 - KM10 - KM11 - KM12