

I got this today and I can't say I can find any information on it or how to use it.
The drill is a Milwaukee Heavy Duty but the name plate has worn off.
The chuck is an Elliott Tool Dayton Ohio but their website doesn't show anything like this.
I am pretty certain it is for tapping holes but I have only see anything like it from afar.
Anyone got a manual for this thing or atleast know what it is called?