Driver part of a heavy duty mag drill. Basically a strong motor with an integrated reduction gear box. Has a high and low speed. This thing is slow enough for metal working tasks. Might be a good drop in motor for various metal working tools, or for attaching a grinding plate for sharpening plane blades, to keep them from overheating. Drill chuck has damage to one of the jaws, but it would still grip a 3/4" drive shaft fine. Could probably swap out the chuck too if you need something wider.