Features [ADJUSTABLE SPEED] Adjustable grinding speed with maximum speed of 75000RPM, coreless vibration and long term operation. [HIGH EFFICIENCY] The pneumatic grinder pen has average air consumption of 60 L/min, which is efficient and durable. [PORTABLE DESIGN] The air grinding tool is pencil shaped design, lightweight and ideal for operation in narrow areas. [EXCELLENT MATERIAL] Made of stainless steel and plastic materials, which is wear resistant, not easy to deform or rust. [WIDE APPLICATION] Suitable for cleaning jewelry, molds, rotors, backplates, brake pads, cylinder heads, brackets, etc. Specification: Item Type: Air Grinding Pen Material: Stainless Steel + Plastic Uses: Suitable for cleaning jewelry, molds, rotors, backplates, brake pads, cylinder heads, brackets, etc. Model: OW-180 : 75000RPM Pressure: 90PSI Chuck Size: Approx. 2.5mm / 0.1in, 3mm / 0.12in Average Air Consumption: 60 L/min Package List: 1 x Grinding Pen 1 x Hose 1 x Chuck 2 x Grinding Heads 2 x Wrenches 1 x Oil Bottle 1 x Storage Box Note:Please wear protective goggles when using pneumatic tools to avoid eye damage caused by the powder produced by using pneumatic tools. It is forbidden to disassemble the internal parts of the pneumatic tool without special tools. Package List 1 x Grinding Pen 1 x Hose 1 x Chuck 2 x Grinding Heads 2 x Wrenches 1 x Oil Bottle 1 x Storage Box