Lightweight 2,000 RPM Free Speed 90 PSI Air Pressure 82 dBa Angle gear mechanism All the power at half the noise! The superior mechanics and internal mechanisms of the AIRCAT® right angle die grinder includes high-quality bearing surfaces, air chambers and turbines. The patented exhaust muffler/filter technology reduces the level of noise while retaining more power and torque. A quiet, powerful tool ideal for shop or home applications.