Features Professional Made: Industrial grade pneumatic air mill, small in size and light in weight, with muffler device, has light vibration and low noise during operation. Premium Material: The shell is made of zinc alloy, wear and corrosion resistant, and the handle is wrapped with red protective cover, comfortable to hold. Convenient to Operate: The pneumatic grinding machine is designed with long straight handle, which is convenient to grip, suitable for long term operation. High Efficiency: The no load speed of this air die grinder can reach 20000rpm, with low air consumption, which helps greatly improve work efficiency. Wide Applications: For local grinding spot areas, to remove solder joints and rust spots on metal products, to deburr wood, or for automotive polishing. Specification: Item Type: Air Die Grinder Model: YDE 4952 Material: Zinc Alloy Collet Size: 1/4in(6mm) or 1/8in(3mm) No Load Speed: 20000rpm Air Pressure: 90psi (6.3kg/cm²) Air Consumption: 4.0cfm Air Inlet: 1/4in Overall Length: Approx. 280mm / 11in Package List: 1 x Pneumatic Grinder 2 x Wrench 1 x Intake Connector Note: Operation Suggestion: 1. Before and after use every day, please inject 2‑3CC of #60 pneumatic lubricating oil (sewing machine oil) from the air inlet. 2. Let the machine idle for a few seconds after filling with oil. 3. Generally, the air source compressed by the traditional air compressor contains water, and the lubricating oil in the air compressor brought out by the aircompressor piston. If the oil water separator is not used, the water and oil enter the pneumatic tool with the air, which will cause wind If the blade is stuck, once the tool is started, the blade will not be thrown away, and it may not even be able to start. If it can be started, the torsion will be insufficient. Be sure to pay attention to refueling regularly to keep the tool at normal torsion. Package List 1 x Pneumatic Grinder 2 x Wrench 1 x Intake Connector