Model: GP-836D Features 1/2″ capacity industrial rated chuck. Reversible action, and one hand reverse lever. Positive action trigger to speed control. Variable speed throttle for ease of starting hole. Handle exhaust directs air away from work. Built-in muffler reduces noise level. Planetary gear system for long life. Auxiliary side handle standard. Extra heavy duty 800 r.p.m. drill for extra hard work. Double reduction planetary gears for exceptional power. Double reduction planetary gears. Specifications Capacity 1/2″ Maximum Speed 800 rpm Net Weight 1.76 kg Length 203 mm Air Consupmtion 0.56 m3/min Air Inlet 1/4″ Hose Size 6.5 mm Sound Pressure 82 dBA Air Pressure 90 psi Vibration <2.5 m/S2