The spindle is lubricated with grease, which is resistant to high temperatures up. Precision steel ball retainer is used to ensure the rotary accuracy of the spindle when grinding at high speed. Circulation cooling, the spindle shell adopts liquid circulation cooling to reduce the temperature rise caused by high-speed rotation. Adopt fan cooling, convenient and trouble-free, no need for water pipes/sinks and pumps, just and play. The body is made of stainless steel, which is not easy to rust. Longer life., Manufacturer: QAXRZCUCD