Features 1、[PORTABLE DESIGN] The air grinding tool is pencil shaped design, lightweight and ideal for operation in narrow areas. 2、[ADJUSTABLE SPEED] Adjustable grinding speed with maximum speed of 75000RPM, coreless vibration and long term operation. 3、[WIDE APPLICATION] Suitable for cleaning jewelry, molds, rotors, backplates, brake pads, cylinder heads, brackets, etc. 4、[EXCELLENT MATERIAL] Made of stainless steel and plastic materials, which is wear resistant, not easy to deform or rust. 5、[HIGH EFFICIENCY] The pneumatic grinder pen has average air consumption of 60 L/min, which is efficient and durable. 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 Maximum Speed: 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