Ingersoll Rand Pistol Grip Reversible Air Screwdriver — 1/4in. Chuck Size, 4 CFM, 1800 RPM, Model# 371. Chuck Size:1/4in. Air Consumption:4CFM. CFM at Load:29. Speed:1800 RPM. Reversible:Yes. Variable Speed:Yes. Side Handle:No. Air Inlet Size:1/4 in. Min.