Medium Size ● 0.5 inch (12.7 mm) Square Drive N Type Impact Wrench for Industrial Use ● A must have for the future working environment! Ultra lightweight, low vibration, low noise, and high durability; Patented ultra-lightweight 3.3 lbs (1.57 kg) light; Low vibration, low noise; achieved 78 dB (A) by our unique high efficiency sound reduction structure "Multi-expansion exhaust sound deadening structure (patent pending)" (at non-operating air pressure 0.6 MPa (PE)