Features APPLICABLE SCENARIO: Pneumatic engraving pen is suitable for sanding, polishing, drilling, engraving, trimming, deburring EASY TO GRIP: The air micro grinder is stable and can hold different grinding tools for work LIGHTWEIGHT AND COMFORTABLE: The air pneumatic engraving pen come with a lightweight body for a sleek, streamlined look and comfortable grip FLEXIBLE AND ADJUSTABLE SPEED: Pneumatic engraving pen rotary for speed regulation, adjustable at will, adjust according to the actual requirements of rotation required speed DURABLE AND STABLE: The air micro grinder use linear bearings to increase product concentricity and wear resistance Specification: Item Type: Pneumatic Engraving Pen Free Speed: 7000rpm Chuck Size: 2.38/3mm Working Air Pressure: 0.4-0.6Mpa Intake Connection: 1/4in Package List:1 x Pneumatic Pen1 x Intake Joint1 x Air Pipe2 x Wrench1 x Chuck1 x Oiler1 x Storage Box Package List 1 x Pneumatic Pen 1 x Intake Joint 1 x Air Pipe 2 x Wrench 1 x Chuck 1 x Oiler 1 x Storage Box