Air Operated Post Driver, Portable & Efficient, Great For Single Or Multiple Post Installations Under 2" In Diameter, All Steel Workmanship, Very Few Moving Parts Gives The Rugged Driver Extreme Durability For Lifetime Performance, Uses 2 CFM @ 90 PSI, Use Air To Lift The Weight & Simply Pull Down To Release The Air Through The Exhaust Valve, Eliminates Fatigue As The Inner Cylinder/Piston Is Forced Downward In The Body By Compressed Air Which Raises The Unit, No Accidental Cycling While Off The Post, No Pinch Points & No Adapters Required, Safe, Requires In Line Oiler For Small Air Compressors Or Manual Lubrication, 1 Year Warranty Parts & Service.