1850-TH 1" Composite Impact Wrench From AIRCAT Pneumatic Tools AIRCAT's 1" Composite Impact, No. 1850-TH, features a twin-hammer mechanism, weighs 18 lbs. and has a working torque of 170 ft./lbs. to 1,380 ft./lbs., with a max torque of 1,800 tf./lbs. The tool chimes in at 89 decibels.