The most excellent total balance of rotational speed, weight, motor diameter, and torque. Lightweight, compact, general-purpose type ideal as precision microfabrication. High performance brushless motor eliminates the need to replace carbon brushes. The rotation speed does not change much even when the load changes, enabling tenacious and stable cutting and grinding. The motor is quiet from low speed to high speed, and can smoothly change speeds as desired. Compatible control unit: NE249 Power cord length: 1.5 m Maximum output(W):73 No-load speed(min(-1 power)):1000~40000 Maximum torque(cN-m):4.3 Width(mm):97 Depth(mm):24.5 Dimensions(mm):24.