Deep Drill Hole Marker
This innovation is a special black Marker for holes that need to be drilled and that are recessed behind a bracket or other kind of cover. (Think of attaching shelves to a wall with deep brackets that hide the holes.) This simple tool is a job saver" when you need it. It will reach through a 1" deep sleeve. Get one and keep it in your toolbox. You will need it in time - 100% guaranteed.