Heavy duty gearing for high performance jobs Muffled handle exhaust for extra quiet operation Heavy duty side handle for added control Reversible 1/2" Jacobs keyless chuck included Specifications: Free speed: 700 RPM Chuck size: 1/2" Air inlet: 1/4" NPT Air consumption: 4 CFM Length: 7-1/2" Weight: 4-1/2 lbs.