Universal Tool UT8963ATT-5 Pistol-Trigger Start Automatic Shut-Off Air Screwdriver Air on top version allow for Clean Vertical Suspension without trailing hoses Adjustable Auto Shut- off for smooth precision, smooth disengagement and minimum vibration Convenient thumb operated reverse precision engineered for ultimate reliability Rear Exhaust with built in silencing system and built in suspension bail Air on top version allows for clean vertical suspension without trailing hoses Adjustable auto shut-off for smooth precision, smooth disengagement and minimum vibration Convenient thumb operated reverse Precision engineered for ultimate reliability Rear exhaust with built-in silencing system and built-in suspension bail