MAC TOOLS 1/2 REVERSIBLE AIR DRILL 800 RPM MODEL AD590? JACOBS CHUCK. It’s missing it’s model number badge. I think it’s an AD590 but not totally sure. I gage it a quick test and it worked well.

Brand: Mac Tools
Accessories: 1/2in. Chuck
Type: Pistol Grip (Standard)
Air Inlet Size: 1/4in.
Manufacturer Part Number: AD590
Maximum Speed(RPM): 800RPM
Features: Reversible