For standard coupler connections without a control system. Offers more power (20+ watts) and durability with less noise (62 dBa of sound) than previous generations. Dynamic speed control in the head helps maintain cutting power and limits free speed to help prevent premature bearing wear. Free speed is approximately 410,000 rpm. 4-port water spray and Diamond-Like Carbon (DLC)-coated ceramic bearings. 2-year warranty, extra 6 months when maintained by Midwest® Automate®.