Small size and light weight, the pen design make it easy to use with one hand Precision designed blade grinder, safe and durable.Easy to use, convenient to load and unload High-speed rotation can adapt to high-speed precision machining Excellent internal design, coreless vibration and can work for a long-term Suitable for precision grinding of various metals, cleaning, chamfering, grinding, engraving, internal processing of various metals, cutting, grinding, grinding of plastics, stone, wood, etc.,Specification: Condition: 100% Brand New No-load Speed: 54000rpm Chuck Specifications: 3-6mm Pen Diameter: 16mm Average Air Consumption: 60 L/min Weight: Approx. 781g / 27.5oz