Variable Speed Automatic Spin Pneumatic Screwdriver - MSI PRO 1/4-Inch Air Power Positive Clutch Screwdriver - 800 rpm, 9.6" L QUICK CHANGE Hex Collet Aluminum pistol grip handle, specially designed for Automotive and Industrial use VARIABLE SPEED AUTOMATIC trigger. Spindle turns after operator exerts forward pressure. Great for sheet metal screws, wood screws, machine screws and lag bolts NPT: 1/4"  Air Hose: 3/8"  PSI: 90  CFM: 4