This was a find many years ago. Bought it for my dad and I to use because we only had a Wards 1/2hp 7.5 gal. air compressor at the time. It wasn't enough to run a 1/2" impact so we bought this to get us by until we could get a more powerful compressor.
Heavy duty 1/2" electric impact came with a Proto impact socket set and a 1/2 Jacobs drill chuck that turned the impact into an impact drill
We used it for about five months and then dad and grandpa pitched in and bought a Sears 1hp 12 gal air compressor to run the air tools. I got it when dad passed away and used it for some years when I was in college where I didn't have a shop -- basically just working on a driveway or street.