Features MULTI FUNCTIONAL: Pneumatic engraving pen paired with different bits is suitable for grinding, polishing, drilling, carving, trimming, and deburring. STABLE AND FIRM CLAMPING: Air die grinder can clamp different grinding tools for work., ensuring accurate and efficient works. ADJUSTABLE SPEED: The rotation speed can be adjusted freely, and the required speed can be adjusted according to actual requirements. HIGH CONCENTRICITY: Adopting linear bearings to increase product concentricity, wear resistant and durable. EASY TO USE: Pneumatic grinder is lightweight in body, fashionable and streamlined appearance, has a comfortable grip. Specification: Item Type: Pneumatic Pencil Grinder Set Material: Aluminum Alloy Product Mode: KP 6102 Free Speed: 65000rpm Clamp Specification: Approx. 2.38mm / 0.09in, 3mm / 0.12in Working Pressure: 0.4 to 0.6Mpa Inlet Connector: 1/4in Package List:1 x Pneumatic Grinding Pen 2 x Grinding Head  1 x Air Inlet Connector  1 x Air Hose2 x Wrench 1 x Clamping Head  1 x Oiler 1 x Plastic Box Package List 1 x Pneumatic Grinding Pen 2 x Grinding Head 1 x Air Inlet Connector 1 x Air Hose 2 x Wrench 1 x Clamping Head 1 x Oiler 1 x Plastic Box