Ingersoll Rand pneumatic Screw driver or for accepting any 1/4” hex bit.
Can also be used with a 1/4” hex shaft to 3/8,1/4”or1/2” adapter.
12” long with air fitting and 1.125” diameter.
Model 3RPMS1
Rpm 1650-90PSIG/Max
Torque range 2.50-20.00.
Serial# A00M19054
I have seen these rebuilt selling for about $300.