How to Use: Recommendations for using air tools: 1. Before and after use every day, please inject 2‑3CC of 60 pneumatic lubricating oil (clothing 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 air compressor piston. If the oil water separator is not used, the water and oil enter the pneumatic tool with the air, which will cause wind blade stuck, once the tool is started, the blade will not be thrown away, and may not even be able to start. If can be started, the torsion will be insufficient. Be sure to pay attention to refueling regularly to keep the tool at normal torsion. Specification: Item Type: Pneumatic Grinder Material: Zinc alloy Chuck Size: 1/4in(6mm) or 1/8in(3mm) No Load Speed: 4000rpm Air Pressure: 90psi 6.3kg/cm² Air Consumption: 4.0cfm Air Inlet: 1/4in Product Length: Approx. 210mm / 8.27in Package List: 1 x Pneumatic Grinder 2 x Wrench 1 x Air Inlet Interface