This high precision tool in a pen style design is only 13/8" in diameter. The ergonomically designed gripping area assures for most comfortable handling and optimal control. The quiet, vibration-free drive via the permanent magnet motor, the ground spindle and collar bearing all contribute to the ergonomic design. The built-in speed control allows variable speed between 5,000 and 20,000 RPM. This tool is ideal for work on metals, wax, plastics, wood and even precious stones. Comes with power supply with side retractable rest for micromotor and holes for storing bits. Positive temperature coefficient prevents overload due to heat.