Specifications: Air Consumption - ft3/min: 14.0 Air Inlet Thread N.P.T. - in: 1/4 Average Air Consumption - m3/min: 0.4 Collet Chuck Size - in: 1/4 Collet Chuck Size - mm: 6 Free Speed - rpm: 20000 Noise Level - dB(A): 82 Overall Length (approx) - in: 6 1/2 Overall Length (approx) - mm: 165 Rated Horse Power - w: 315 Weight - lb: 1.43