Hi-Power Milling Chucks Very high clamping force leads to increased productivity and tool life. Roller bearing design provides high friction resistance. High run our accuracy - 5 micron @3D. Less wear on cutting edge leads to significant increase in tool life. Excellent finish on machined surface due to less vibration. Protected with anti-corrosive coating. Perfect seal mechanism of clamping nut, prevents dust and coolant entry. Thereby, extending life of the holder.