3/4" Square Drive Designed to minimize torque spike on hard joint applications or where tool weight or application process is a concern Provides increased power under load with the 9-blade double-chamber motor and patented double-blade pulse mechanism Recommended Air Pressure: 85 psi NOTE: Torque ranges reflect residual B joint torque values Specifications: Model: ALPHA-140 Air Consumption - ft3/min: 24.7 Air Hose Size - in: 3/8 Air Inlet Thread N.P.T. - in: 1/4 Free Speed - rpm: 3,100 Noise Level - dB(A): 84 Overall Length (approx) - in: 8.9 Overall Length (approx) - mm: 226 Square Drive - in: 3/4 Torque Range - ft lbs: 109.9 ~ 169.2 Torque Range - Nm: 150 ~ 230 Weight less Socket - kg: 3.3 Weight less Socket - lb: 7.4