Features WORK PARAMETERS: Air die grinder pen kit, with no load speed of 55000rpm and a working pressure of 90psi, has high efficiency and low consumption. METAL GEAR SET: The pneumatic grinding pen adopts tungsten steel alloy gear set, which is wear resistant, improves grinding speed and efficiency. PORTABLE DESIGN: The air die grinder is pen shape design that can be used with one hand, suitable for engraving, grinding, polishing in narrow areas. APPLICABLE MATERIAL: The pneumatic grinding pen can be used for metal, plastic, stone or wood processing, can be used for grinding, polishing and cleaning. STANDARD INTERFACE: This air die grinder pen has 1/4in standard inlet port, stable connection without leakage, equipped with hose and filter, convenient to use. Specification: Item Type: Air Die Grinder Kit Material: Alloy Steel, Tungsten Steel Alloy No Load Speed: 55000rpm Inlet Port: 1/4in Working Pressure: 90psi Air Consumption: 5.5cfm (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 Port 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