What features must a pistol-grip air screwdriver have?
The shape of a pistol air screwdriver is essential for making it possible to work in different ergonomically correct positions.
Pistol grips, for example, must allow four different types of grip:
“high” grip to exert adequate pushing force while keeping the tool axis in line with the arm axis
“low” grip when less pressure is required during rundown or alignment
“forward” grip to help make the screwdriver more balanced
“upgrip” to work with an overhead air supply and tighten in awkward-to-reach spots.