This Chicago Pneumatic 1/2in. heavy-duty quiet air ratchet features an adjustable noise level - as low as 79 dBA and a patented Tri-Spring antislip head. Delivers up to 90 ft.-lbs. of torque. Noise Level (dB): 79, Drive (in.): 1/2, Inlet Size (in.): 1/4, Variable Speed: Yes, Tool Length (in.): 12, Average Air Consumption (CFM): 5, Tool Weight (lbs.): 2.7, Speed - No Load (RPM): 190, Min. Hose Size (in.): 3/8, Case Included: No, Max. Torque (ft.-lbs.): 90, Reversible: Yes