A tool for which there is no other solution. When you're drilling a wall from side to side, looking for studs, or just need to quickly drill a 12" pilot hole, this gem will be the answer to your prayers. Does this HVAC duct run behind drywall? I will find out here. Out of foil and need to make a tube quickly? Drop the kid and make some friends. Takes up almost no space in your trick kit. Don't get caught without one.