Hollow for threaded rod? At that point I don’t know you will see a full set if only becasue the common uses for threaded rod is mostly electrical work and those Klein sizes are the common sized.
Outside of that it almost sounds like you want longer sockets. Now some years ago I did find a set of extra long 1/4 drive sockets. Not sure they were 4 inches but they were probably 3+. no magnets
They most likely also come in metric too. but I’ll warn you there were expensive if I recall made by Cromwell tool or perhaps MAC. and I really saw no reason to use them. Today you find some speciality long sockets like there is an extra long spark plug socket. and some extra long 19mm and 22 mm which are common tire lug sizes.