Air Angle Grinder Features include... Standard aluminum handle with built-in comfort grip. Swivel guard adjustable to 9 positions. Low noise rating: 83 dB 4 CFM @ 90 PSI Governor controlled to maintain grinding speed Excellent for continuous heavy duty grinding 10,000 RPM Wheel type: 27 Switch type: self-locking Rear exhaust Spindle size: 5/8" - 11