Features Work parameters: the air grinding pen set with an idle speed of 55,000 rpm and a working pressure of 90 psi offers high efficiency and low consumption. STANDARD INTERFACE This air grinding pin adopts 1/4 inch standard inlet connection, stable connection without leakage, is equipped with hose and filter, and convenient to use. Applicable material: the pneumatic grinding pen can be used for metal, plastic, stone or woodworking and can be used for grinding, polishing and cleaning. Metal gear set: the pneumatic grinding pin has a gear set made of tungsten steel alloy, which is wear-resistant and improves grinding speed and efficiency. Portable design: the air rod grinder is pin-shaped and can be used with one hand. It is suitable for engraving, grinding and polishing in tight areas. Specification: Item Type:Air Rod Grinder Set Material: alloy steel, tungsten steel alloy. Idle speed: 55,000 rpm Inlet connection: 1/4 inch. Working pressure: 90 psi Air consumption: 5.5 cfm (l/min). Package list: 1 x air grinding pen. 1 x hose. 2 x wrenches 1 x oil bottle. 1 x chuck. 1 x inlet connector. 1 x filter. 1 x storage box Package List 1 x Air Grinding Pen 1 x Hose 2 x Wrenches 1 x Oil Bottle 1 x Chuck 1 x Inlet Port 1 x Filter 1 x Storage Box