I used it to clean up a few hand tools but it mostly sits in my garage. Comes with wire brush wheel as well as two grinding wheels (36 grit and 80 grit).
From the home depot product description:
5 Amp variable speed motor goes anywhere from 2000 RPM to 3400 RPM
Slower speeds maximize precision while high speeds help with fast material removal
Flexible work light helps keep your workpiece illuminated during operation
Onboard quenching tray helps cool down workpieces during long grinding sessions