Features Tungsten Steel Alloy Gear Set: The pneumatic air grinding pen's adopts tungsten steel alloy gear set, which has strong wear resistance and longer service life. High Speed: The bearings of the pneumatic wind grinder can withstand a high speed of 50000RPM, which improves the grinding speed and efficiency. Lightweight and Portable: This pneumatic air grinding pen is small and light weight with a pen shaped appearance. Easy to use and friendly to novices. One Handed Use: The pneumatic air grinder pen can be used with one hand, ideal for use in some narrow areas, easy to load and unload, and easy to carry. Multiple Uses: This pneumatic air grinder can be used for grinding of metals as well as cutting plastics, stones, wood, etc. Can also be used for grinding and polishing, and is suitable for backing plates, brake pads, etc. Specification: Item Type: Pneumatic Air Grinder Pen Material: Alloy steel, tungsten steel alloy No Load Speed: 50000rpm Air Inlet Connection: 1/4in Air Consumption: 5.5cfm (l/min) How to Use: Put 2‑3 drops of pneumatic lubricant at the air inlet before and after each use, then idle for a few seconds to complete the maintenance. packing list: 1 x Pneumatic Engraving Pen 1 x Air Hose 2 x Wrench 1 x Oil Bottle 1 x Chuck 1 x Air Inlet Interface 1 x Filter 1 x Storage Box Package List 1 x Pneumatic Engraving Pen 1 x Air Hose 2 x Wrench 1 x Oil Bottle 1 x Chuck 1 x Air Inlet Interface 1 x Filter 1 x Storage Box