The "engraving pen" is a small tool driven by the principle of aerodynamics, which is usually used for fine cutting, grinding and engraving work. It usually consists of a handle holding the pen tip and a mechanical component driven by compressed air.

The pen can be used to process a variety of materials, including metal, wood, plastic and glass. It is widely used in metal working, woodworking, glass technology, mold making and other industries, for removing surface dirt, defects, fine engraving, polishing and finishing work.

The grinding pen usually has adjustable speed and strength, allowing the operator to accurately control according to different working requirements. They are small, portable and easy to operate, suitable for a variety of work environments and hard-to-reach areas.