It's a Chicago Pneumatic die grinder. I really don't need to say anything else. I use it for cleaning and smoothing multipass, full penetration, UT welds. It does an incredible job of smoothing out, or removing any voids, tight corners, or narrow laps in between passes. I use 4 die grinders, all with different shaped burrs, for this. I wish they were all CP die grinders.
Rating: [5 of 5 Stars!]