I have found Snap-on tools to have excellent spanner wrenches, also their other tools more than stand up to test. They have a line of wrenches called "Flank drive plus" that are GREAT for removing items that have rounded off flats. This is from divers trying to do their own stuff with THE WRONG TOOLS!!! (a pet peeve of mine, from my dive shop days) Their sockets are also very good.