In today's age I think they are kinda useless. I have them in every size from 1/4-3/4. Other than the 1/4" ,I might have used the other ones one time in the past 20 years. The 1/4" drive I have used it for freeing up frozen brake bleeder screws.
Before I would grab a T-Bar , I would grab a long breaker bar.I think that most of my 3/8" ratchets would hold up to the force I would put on either the T-Bar or ratchet in that size.Once I brake something loose I would normally put my impact wrench on it and spin it off.
Ken - that's what i was thinking. anything i can reach w/ two hands i can probably fit a breaker bar into, and a good ratchet is designed to handle the torque for roughly the same handle length has one of these slider bars. seems like a solution looking for a problem.
taps, and they are nice for installing lots of screws. Say your putting on a valve cover and you have 10 screws to instal you can put the socket in the middle of the bar and spin it. It works really fast because the bar has some momentum
It works best for taps if you have a set of the tap sockets. Lisle makes a set of I think about 8 sockets that fit the square drive on most of the taps from 6-32 t0 1/2-13. Using them keeps me from having to use those horrible adjustable tap t handles.
good to have asked this question. i snapped off a tap today because i had to force one of those **** T-handles too hard. just ordered a slide bar and socket tap set. thanks for the help,
Here's another use. I had to remove a large bolt with a rather shallow head. On a breaker bar, the socket wanted to angle off the head of the bolt. With the slider bar, I could set the bar in the center, and the socket would stay nicely on the bolt.
I'll also sometimes put a long extension on one, and use it as a speeder.
While we are on the subject can anyone recall which brands allow the bar to move flush with the drive head of the t bar? We had a thread a while ago, but I can't find it.