Description of Universal Track Drill by Woody's - UNIV DRIL
Perfect every time makes studding easy. Hollow drill for 7mm or 5/16in. studs makes a precise opening for installing studs. For 7mm T-nut studs and 5/16in. push-through studs use 7mm drill.
Lubricate it with WD-40 and keep it hot, drilled 144 holes with no problems and never needed sharpening. Much better than a regular drill. After lubricating with WD-40, the spark plugs popped out on their own and were able to continue working.
This tool works very well. This left 144 nice clean bolt holes. I would buy this tool again if I lost what I have now. It works significantly better than a standard drill. The only minor knock I have is that I can find that the tool became blunt at the end of the job. Tracks aren't the easiest material to get into, so I guess that's to be expected. It's still sharp enough to drill many more holes.