These tools make changing your packing so much easier! And faster! You cannot appreciate how useful this tool is until you've used one. The flexible shaft is a real advantage when having to reach down into a narrow bilge sump, and the auger head lets you pull the packing straight out, instead of having to attempt to pry it out sideways with a screwdriver --- especially nice with that last, buried, ring of packing. Leave your screwdriver for screws, every boat should have one of these.