Feature:1. Efficient Use: This air die grinder has 22000rpm high no load speed, which enables stable working performance with higher efficiency.2. Reliable Work: The pneumatic die grinder with muffler has low work noise and small vibration, compatible with 1/4in and 1/8in collet.3. Broad Utility: Suits perfectly for local grinding of key areas, removal of solder joints and rust spots on metal products and so on.4. Better Design: Combining ergonomic zinc alloy body and comfortable handle with red protective cover, the manual operation is simpler.5. Easy Carrying: Comes with a light weight and a compact size as well, both the daily storage and carrying are very convenient.How to Use:1. Before and after daily use, please inject 2‑3CC of #60 pneumatic lubricating 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 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 blade stuck, once the tool is started, the blade will not be stretch, and it may not even be able to start. If it can be started, the torsion will&n